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Steven C. Hayes

Steven C. Hayes is an American clinical psychologist and researcher best known for originating Acceptance and Commitment Therapy (ACT), an evidence-based form of psychotherapy that emphasizes psychological flexibility by encouraging acceptance of private experiences while committing to actions aligned with personal values. He developed Relational Frame Theory (RFT), a behavioral account of human language, cognition, and derived relational responding that underpins ACT and has influenced broader contextual behavioral science. As Emeritus Professor of Psychology at the University of Nevada, Reno, where he served as Nevada Foundation Professor and directed clinical training, Hayes has trained dozens of Ph.D. students and founded the Association for Contextual Behavioral Science (ACBS), a global organization advancing functional contextual approaches to psychology. Hayes' work extends to co-developing Process-Based Therapy (PBT), which integrates processes of change across therapeutic traditions based on empirical evidence rather than protocols, and Prosocial, a group intervention drawing on ACT principles to foster cooperation. His research has generated substantial empirical support for ACT, with over 1,000 randomized controlled trials demonstrating its efficacy across conditions like anxiety, depression, chronic pain, and substance use, alongside more than 400 meta-analyses. Hayes has authored or co-authored 47 books, including influential texts like Acceptance and Commitment Therapy: An Experiential Approach to Behavior Change, and nearly 700 peer-reviewed articles, earning him recognition as one of the highest-impact psychologists worldwide, with rankings placing him among the top scholars in citations and influence. Among his notable recognitions are the Lifetime Achievement Award from for Behavioral and Cognitive Therapies and the B.F. Skinner Award from the Society for the Advancement of Behavior Analysis, reflecting the applied and scientific impact of his contributions to understanding experiential avoidance and promoting value-consistent living over symptom suppression. As president of the Institute for Better Health, a long-standing nonprofit, Hayes continues to disseminate these approaches through workshops, media, and public outreach, emphasizing idiographic (individualized) analysis in interventions.

Early Life and Education

Childhood and Formative Influences

Steven C. Hayes grew up in during the post-World War II era, experiencing a childhood marked by family secrets tied to . His mother, whose maiden name was Ruth Esther Dreyer, was Jewish but concealed her heritage due to pressure from her father over concerns about "tainted blood." Dozens of Hayes' aunts, uncles, and cousins perished in , including his and family, who died when their ship, the Struma, was torpedoed in 1942. At around age 8 in the mid-1950s, Hayes witnessed his mother's intense reaction to black-and-white television footage of , as she leapt from their pink-and-grey sofa, spat on the screen, and abruptly left the room—an event that highlighted her unspoken pain but remained incomprehensible to him at the time. These concealed family dynamics contributed to a sense of unresolved loss in Hayes' early years, later providing context for his understanding of and societal wounds. By high school, attending University High School affiliated with the , Hayes developed an interest in , drawn to its potential to blend art, science, and the alleviation of human . The 1960s counterculture profoundly shaped Hayes' formative years, coinciding with his attendance at Loyola Marymount University, where he earned a B.A. in psychology in 1970. Influenced by the hippie movement's heyday, he grew his hair to 12 inches long as a freshman, lived on a commune where he helped construct a house, and experimented with illegal substances—experiences that reflected the era's emphasis on personal exploration and communal living but later complicated his graduate school applications. To avoid the Vietnam War draft, he briefly cut his hair to join Air Force ROTC, an act met with a standing ovation in the cafeteria, underscoring the cultural tensions of the time. These influences fostered an early skepticism toward rigid authority and a focus on behavioral change, laying groundwork for his later psychological innovations.

Academic Training

Steven C. Hayes earned a degree in , cum laude, from in , , in 1970, with a minor in . His undergraduate honors included designation as a California State Scholar. Hayes pursued graduate training in at in , where he completed a degree in 1974. His master's , titled "Environmentally Destructive Walking Patterns: An Applied Analysis," was supervised by John D. Cone, Ph.D. He remained at for his doctoral studies, receiving a Ph.D. in in 1977 from an American Psychological Association-approved program. His dissertation, "The Effects of Monthly Feedback, Rebate Billing, and Consumer Directed Feedback on Residential ," also examined applied behavioral interventions and was chaired by John D. Cone, Ph.D. Following his doctorate, Hayes completed a clinical under David H. Barlow at the School of Medicine. This training emphasized behavioral and cognitive approaches, influencing his early research on empirical clinical methods.

Professional Career

Early Career and Academic Appointments

Following receipt of his PhD in from in 1977, Hayes secured his initial academic position as an instructor in the Department of Psychology at the at Greensboro in 1976, a role that transitioned into from 1977 to 1982. He was promoted to associate professor at the same institution, serving in that capacity from 1982 to 1986, during which period he contributed to the development of clinical training programs and generated foundational research on cognitive and behavioral methods in . In 1986, Hayes relocated to the , accepting an appointment as full professor in the Department of and assuming the role of Director of Clinical Training, positions he held concurrently through the early 1990s. Concurrent with these responsibilities, he directed the university's Psychology Clinic from 1986 onward and established the Behavioral Psychotherapy Laboratory in 1989, fostering empirical work in and contextual behavioral science. These appointments marked the onset of his long-term affiliation with UNR, where he advanced from foundational clinical training oversight to leadership in behavioral programs.

Leadership Roles in Psychology Organizations

Steven C. Hayes has occupied several influential leadership roles in organizations advancing behavioral science, cognitive therapies, and contextual approaches within psychology. These positions reflect his contributions to integrating basic behavioral research with applied clinical practices.
OrganizationPositionTerm
American Psychological Association (APA) Division 25 (Experimental Analysis of Behavior)President-Elect1985–1986
American Psychological Association (APA) Division 25 (Experimental Analysis of Behavior)President1986–1987
American Psychological Association (APA) Division 25 (Experimental Analysis of Behavior)Past-President1987–1988
American Association of Applied and Preventive PsychologyVice-President1993–1994
American Association of Applied and Preventive PsychologyPresident1994–1996
Association for Advancement of Behavior Therapy (predecessor to Association for Behavioral and Cognitive Therapies)President-Elect1996–1997
Association for Advancement of Behavior Therapy (predecessor to Association for Behavioral and Cognitive Therapies)President1997–1998
Association for Advancement of Behavior Therapy (predecessor to Association for Behavioral and Cognitive Therapies)Past-President1998–1999
Association for Contextual Behavioral SciencePresident-Elect2006–2007
Association for Contextual Behavioral SciencePresident2007–2008
Association for Contextual Behavioral SciencePast-President2008–2009
World Congress of Cognitive and Behavioral TherapiesChair2008–2010
Hayes also served as the first Secretary-Treasurer of the Association for Psychological Science during its formative years. More recently, he has been President of the Institute for Better Health, a dedicated to behavioral health research and application.

Theoretical and Scientific Contributions

Development of Relational Frame Theory

(RFT) originated from Steven C. Hayes' efforts to address limitations in B.F. Skinner's 1957 analysis of by developing a functional contextualist account of derived relational responding as the basis for human language and cognition. Hayes, along with Alan J. Brownstein, first introduced core ideas at the 1985 Association for Behavior Analysis annual convention, drawing on empirical research into stimulus equivalence pioneered by Murray Sidman in the 1970s and 1980s. This work built on Skinner's framework while incorporating Wittgenstein's view of language as a socially embedded activity rather than a representational system, emphasizing relational frames—contextually controlled patterns of bidirectional stimulus relations—as the functional unit of symbolic behavior. Early experimental foundations emerged in the late through studies demonstrating how humans derive untrained relations between stimuli, such as equivalence classes, beyond simple pairing (e.g., Devany et al., 1986; Hayes et al., 1987). Hayes formalized the concept of relational frames in publications like Hayes (1991) and Hayes and Hayes (1989, 1992), positing that these frames enable arbitrary relational responding (e.g., "same," "opposite," "more than") learned through social and generalized across contexts. Additional milestones included Steele and Hayes (1991) on rule-governed behavior and Dymond and Barnes (1995) on hierarchical framing, involving collaborations with Dermot Barnes-Holmes at the , . These efforts shifted focus from static to dynamic, multi-relational networks, supported by lab demonstrations of transformation of stimulus functions via derived relations. The theory coalesced in the 2001 book Relational Frame Theory: A Post-Skinnerian Account of Human Language and Cognition by Hayes, Barnes-Holmes, and Bryan Roche, which synthesized over a decade of basic research into a comprehensive model predicting how relational framing accounts for phenomena like , , and cognitive fusion. This publication marked RFT's maturation, influencing (ACT) by providing a process-based explanation for verbal processes in (Hayes et al., 1999). Subsequent developments, including the Implicit Relational Assessment Procedure (IRAP) around 2006, extended empirical validation, though RFT faced debate over its departure from traditional stimulus equivalence paradigms.

Creation and Evolution of Acceptance and Commitment Therapy

Acceptance and Commitment Therapy (ACT) emerged from Steven C. Hayes' work in the late 1970s, initially as "comprehensive distancing," a technique developed in collaboration with Robert Zettle at the University of North Carolina at Greensboro to extend B.F. Skinner's radical behaviorism—particularly concepts of verbal behavior and rule-governed action—to clinical problems like experiential avoidance and psychological inflexibility. This approach addressed perceived shortcomings in traditional cognitive-behavioral therapies, which Hayes observed often exacerbated issues by prioritizing symptom control over functional adaptation, drawing instead from functional contextualism to promote psychological flexibility through acceptance, defusion, and value-directed action. Hayes' personal experiences with chronic anxiety and panic, which resisted conventional control strategies, further motivated this shift toward processes enabling individuals to engage meaningfully with life despite distressing thoughts and emotions. The foundational treatment manual was compiled in 1981, with an early efficacy study on published in 1984, demonstrating preliminary benefits in reducing avoidance patterns. The first appeared in 1986, initiating a phase of scientific validation within Contextual Behavioral Science, which emphasized transdiagnostic processes over syndrome-specific protocols. By May 1991, the method was renamed during a presentation at the Association for Behavior Analysis, reflecting its core hexaflex model: , cognitive defusion, present-moment awareness, , values clarification, and committed action. The seminal book, Acceptance and Commitment Therapy: An Experiential Approach to Behavior Change by Hayes, Kirk Strosahl, and Kelly Wilson, was published in 1999, providing a comprehensive framework and spurring widespread dissemination. ACT's theoretical underpinnings solidified with the development of (RFT), Hayes' account of human language and cognition as derived relational responding, outlined in a 1985 overview and formalized in a 2001 book, enabling precise analysis of how verbal processes contribute to rigidity. From 2000 onward, ACT entered a maturation with exponential research growth, including international adaptations in countries like the , , and , and applications to diverse areas such as , , and . By 2022, approximately 1,000 randomized controlled trials had been conducted, with 94% in the prior decade, predominantly from lower- and middle-income regions, underscoring its global scalability. In recent evolution, has transitioned toward a fourth phase of idionomic, process-based , prioritizing individualized functional analyses over protocol-driven interventions, as co-developed by Hayes and others to integrate dynamic mechanisms like in psychological processes. This progression maintains fidelity to empirical , continually refining techniques through networked clinician-scientist collaboration rather than rigid adherence to early forms, while critiquing DSM-centric paradigms for overlooking shared inflexibility processes across disorders.

Process-Based Therapy and Broader Applications

Process-Based Therapy (PBT) represents an evolution in psychological , emphasizing the targeting of core, malleable biopsychosocial processes rather than rigid, syndrome-specific protocols. Developed collaboratively by Steven C. Hayes and Stefan G. Hofmann, PBT integrates principles from evolutionary science, , and functional to focus on idiographic assessment and , where treatment is tailored to individual variability in processes such as , , and . This approach critiques traditional psychometric reliance on group-level consistencies, advocating instead for dynamic tracking of processes over time to inform ongoing adjustments. Central to PBT is the identification and modification of key processes like psychological flexibility—the ability to contact the present moment as a conscious human being, defused from unhelpful thoughts, open to emotions, and committed to values-based actions—which Hayes previously operationalized through Acceptance and Commitment Therapy (ACT). In PBT, ACT serves as one modular example within a broader framework, allowing clinicians to select and combine processes based on empirical evidence of their relevance to a client's presenting issues, rather than adhering to manualized treatments. Hayes and Hofmann outlined these competencies in their 2021 skills training manual, which details over 80 evidence-based processes organized hierarchically from biological to contextual levels. Empirical support for this shift draws from meta-analyses showing that process variables, such as those in ACT, mediate outcomes across disorders more reliably than diagnostic categories alone. Beyond clinical therapy, PBT has informed broader applications in intervention science, including digital tools and organizational contexts. For instance, Hayes has advocated for process-based technologies, such as mobile apps like PsychFlex, which deliver targeted interventions by assessing and modifying processes in real-time, potentially addressing cultural biases in by focusing on human challenges like language-derived cognition. In non-clinical domains, PBT principles extend to and workplace , where psychological flexibility processes enhance adaptability and reduce experiential avoidance, as evidenced by ACT-derived programs yielding improvements in employee and performance metrics in randomized trials. These applications prioritize causal mechanisms over symptom reduction, aligning with Hayes' vision of scalable, evidence-driven interventions that transcend traditional therapy boundaries.

Empirical Evidence and Efficacy

Key Studies and Meta-Analyses Supporting Contributions

A 2014 meta-analysis of 60 randomized controlled trials (RCTs) involving over 4,000 participants found that () demonstrated moderate to large effect sizes in reducing symptoms of , , substance use, and , outperforming treatment as usual or waitlist controls, with effects comparable to traditional (). A subsequent 2015 meta-analysis focused on across 36 RCTs reported small to moderate effects for relative to waitlist controls (Hedges' g = 0.82) and non-equivalent active treatments (g = 0.18), supporting its efficacy particularly in primary anxiety conditions like and obsessive-compulsive disorder. Further evidence from a 2020 review of multiple meta-analyses affirmed ACT's equivalence to established evidence-based treatments like CBT for chronic pain management, with sustained improvements in functioning and distress reduction observed in long-term follow-ups. In adolescent populations, a 2025 meta-analysis of RCTs targeting depression and anxiety highlighted ACT's role in enhancing psychological flexibility, yielding significant symptom reductions (standardized mean difference = -0.58 for depression), mediated by processes aligned with Relational Frame Theory (RFT) principles. For workplace applications, a 2022 meta-analysis of face-to-face ACT interventions across RCTs showed reductions in occupational stress and psychological distress, with effect sizes indicating practical utility in non-clinical settings. Regarding RFT, a 2010 citation analysis identified 62 empirical studies from 1991 to 2008 directly testing core tenets, such as derived relational responding and transformation of stimulus functions, demonstrating consistent evidence for RFT's account of human language and cognition beyond simple operant conditioning. These studies, often involving experimental analogs of verbal behavior, supported RFT's predictive validity in areas like analogy formation and perspective-taking, foundational to ACT's mechanisms. An updated analysis through 2016 confirmed ongoing empirical growth, with RFT publications influencing over 1,000 citations annually by the mid-2010s. While RFT's basic research base is robust, applied integrations with ACT in clinical trials, such as those measuring psychological flexibility, provide indirect validation through improved outcomes linked to relational framing processes.

Criticisms and Limitations of ACT and RFT

Critics of Acceptance and Commitment Therapy (ACT) have highlighted issues with its foundational meta-science, arguing that it embraces values such as Machiavellianism, which prioritize strategic influence over objective truth-seeking and thus compromise scientific rigor. Theoretical constructs within ACT, such as those comprising the hexaflex model (e.g., cognitive defusion, acceptance), lack sufficient clarity and distinctiveness, hindering precise empirical testing and clinical application. Psychometric properties of ACT measures, including the Acceptance and Action Questionnaire, have been described as weak, with inadequate validation that limits reliable assessment of purported mechanisms like psychological flexibility. Empirical research on has been faulted for methodological shortcomings, including positive , selective reporting, and designs that obscure causal pathways, rendering claims of unique efficacy overstated compared to established treatments like (). Hofmann and Asmundson (2008) analyzed ACT's critiques of traditional —such as alleged overemphasis on symptom reduction—and found them unsubstantiated, positing that ACT techniques largely overlap with pre-existing elements, functioning more as incremental refinements than revolutionary innovations. Meta-analytic reviews confirm ACT's moderate effects on conditions like anxiety and but indicate no superiority over comparator therapies, with within-group improvements often inflated by non-specific factors like therapeutic alliance rather than ACT-specific processes. Relational Frame Theory (RFT), the behavioral account of and underpinning ACT, has drawn scrutiny for definitional ambiguities, particularly in delineating relational frames as either discrete behavioral classes or cumulative historical products, which Palmer (2004a, 2004b) deemed insufficiently precise to guide testable predictions. Sidman (1994) contended that RFT erroneously subsumes diverse relational types (e.g., , opposition) under a generic "frame" construct, ignoring their unique functional properties and redundantly extending stimulus paradigms without novel explanatory power. Theoretical coherence in RFT has been challenged for overcomplicating Skinner's analysis without falsifiable mechanisms, as noted by critics like Malott (2003) who described its operant framing as excessively abstract and empirically underderived. Empirical limitations of RFT include sparse direct validation of core processes like the transformation of stimulus functions across non-equivalence relations, with laboratory demonstrations often confined to verbal adults and failing to generalize to developmental or clinical populations. Critics argue that RFT's reliance on arbitrarily applicable responding lacks robust causal evidence distinguishing it from simpler associative accounts, potentially inflating its scope beyond verifiable behavioral data. Overall, while RFT aims to unify human cognition under contextual principles, detractors maintain it introduces interpretive latitude that evades stringent experimental disconfirmation, constraining its integration into broader psychological science.

Controversies and Debates

Involvement in Professional Disputes

Hayes has been a prominent opponent of granting prescription privileges to psychologists, arguing that such a shift would erode the discipline's focus on behavioral and contextual interventions in favor of a medicalized model. In a 1996 article co-authored with Elizabeth M. Heiby, he contended that pursuing RxP privileges risks compromising psychology's professional identity, scientific integrity, and by prioritizing pharmacological shortcuts over evidence-based psychological processes. This stance positioned him against segments of organized psychology, including the (APA), which advanced training models for prescriptive authority in states like and starting in the . Hayes co-edited a 1998 volume critically appraising RxP proposals, sponsored by the American Association of Applied and Preventive Psychology (an anti-RxP group), which highlighted constituencies' conflicts and warned of interprofessional tensions with . The debate intensified through the early 2000s, with Hayes contributing to special issues and concluding remarks that summarized arguments against RxP, emphasizing empirical gaps in psychotropic training outcomes and potential dilution of psychology's non-medical expertise. Within behavior analysis, Hayes engaged in disputes over the fidelity of () to B.F. Skinner's , with critics asserting that ACT's functional contextualism represents a departure from Skinner's principles of prediction and control. A 2006 review by Cotter and described ACT as "post-Skinnerian" and not aligned with traditional behavior analysis, prompting Hayes and collaborators to defend as an extension rather than abandonment of behavioral science. This tension reflects broader schisms in the field, where Hayes advocated for pragmatic, process-oriented approaches over strict , influencing debates in journals like the Analysis of . His early work critiquing mentalistic interpretations of further fueled exchanges with Skinnerian purists, as seen in 1992 publications challenging assumptions underlying nonhuman animal research paradigms. Hayes's involvement extended to methodological controversies, including a 2022 resurgence of debate over his 1977 and 1983 papers on covert techniques—imagined aversive pairings used for behaviors like paraphilias—which drew ethical scrutiny for potential and outdated assumptions about behavioral modification. These papers, co-authored with David Barlow and Kelly Brownell, aligned with third-wave shifts but faced retrospective criticism amid evolving standards on and harm in behavioral interventions. Hayes has framed such engagements as necessary for advancing contextual behavioral science against entrenched paradigms, often through organized advocacy within associations like the Association for Contextual Behavioral Science.

Challenges to Mainstream Psychological Paradigms

Steven C. Hayes has critiqued mainstream psychological paradigms, particularly those rooted in traditional and , for their limitations in explaining human , , and . Through , developed in collaboration with Dermot Barnes-Holmes and others, Hayes challenges Skinner's stimulus-response model of , arguing it inadequately accounts for derived stimulus relations—bidirectional links between stimuli (e.g., if A relates to B and B to C, then A relates to C without direct training)—which underpin complex human beyond simple conditioning. RFT posits relational framing as a learned operant process enabling transformation of stimulus functions, such as transferring emotional responses across unrelated concepts, thus providing a functional account of and rule-governed behavior that traditional paradigms overlook. In (), Hayes extends this critique to clinical practice, rejecting traditional CBT's emphasis on modifying dysfunctional beliefs or cognitive content through , which he views as often counterproductive by reinforcing experiential avoidance. Instead, targets psychological inflexibility—manifesting in cognitive fusion, avoidance, and disconnection from values—as the core process of , promoting acceptance, cognitive defusion, and committed action to foster flexibility regardless of thought content. Hayes argues this functional contextual approach, grounded in RFT, outperforms content-focused strategies by addressing how relational processes amplify suffering, with early studies from the onward demonstrating mediation via these processes rather than symptom-specific changes. Hayes further challenges syndromal, protocol-driven paradigms in via process-based therapy (PBT), which shifts from categorizations and group-average efficacy trials to targeting idiographic, dimensional processes like those in the psychological flexibility model. He criticizes traditional for relying on cross-person consistencies and bell-curve standardizations, which ignore within-person dynamics and impose dehumanizing norms derived from historically flawed assumptions, such as those linked to eugenics-influenced concepts of "normalcy." PBT advocates integrating practice-based evidence from diverse populations over Western, Educated, Industrialized, Rich, Democratic ()-biased randomized trials, enabling personalized interventions that address interconnected biopsychosocial factors, as evidenced in Hayes' 2019-referenced meta-analyses on processes. This critiques the field's , urging a pragmatic, principle-driven that prioritizes causal processes over hidden "mental diseases."

Personal Life and Influences

Family and Personal Challenges

Steven C. Hayes experienced severe personal challenges with beginning in the fall of 1978, at age 29, while serving as an of at the University of North Carolina at Greensboro. During a faculty meeting, he suffered his first , characterized by an inability to speak, a racing heart, and the fear of a heart attack, which escalated into frequent episodes that disrupted his professional duties, including teaching. This two-year period of intense suffering prompted Hayes to apply behavioral principles to his own condition, ultimately contributing to the foundational insights behind (), as he shifted from avoidance to acceptance of anxious thoughts and sensations. In his family life, Hayes and his wife Jacque raised four children, facing notable challenges with their son Steven "Stevie" Pistorello-Hayes, diagnosed in preschool with moderate , a genetic condition causing low . Stevie exhibited significant motor delays, unable to throw, catch, kick, climb, or sustain fine motor tasks like drawing for more than minutes, with physical abilities lagging behind peers by over half his age level before ; this led to in early activities, such as team games where peers reacted negatively to his inclusion. Despite initial doubts about his capacity for demanding physical pursuits, the family supported 11 years of training, culminating in Stevie earning a at age 15 in 2021, requiring feats like 50 push-ups and a timed two-mile run, which Hayes attributes to persistent effort over innate limits. The three older children pursued successful careers in art, film, and communications, reflecting family amid these hurdles.

Philosophical and Personal Evolution

Steven C. Hayes' philosophical foundations emerged from a blend of mid-20th-century countercultural influences and empirical behavioral traditions. Raised in during the hippie era, Hayes encountered , Abraham Maslow's concepts of , and B.F. Skinner's vision in Walden Two, which shaped his early interest in transformative . By 1966, while at , he was exposed to behavior therapy principles, leading to graduate training rooted in under influences like Skinner and later mentors such as David H. Barlow. This period marked his initial commitment to a pragmatic, evidence-driven approach, evolving into functional contextualism—a philosophy that posits truth as what works in context for prediction and influence, extending Skinner's by emphasizing scientific over descriptive . A pivotal personal crisis accelerated Hayes' theoretical shift. In the fall of 1978, as a young assistant professor at the at Greensboro, he experienced his first severe , plunging into a decade-long struggle with that disrupted his professional life and prompted existential reevaluation. Traditional cognitive and behavioral techniques failed him, leading to an epiphany during acute episodes where rigid mental control exacerbated suffering, inspiring the core tenets of ()—acceptance of thoughts and feelings alongside value-driven action—which he originated in 1981. This personal ordeal, detailed in his 2019 book A Liberated Mind, underscored the limitations of content-focused psychotherapies and propelled (RFT), an account of human language and cognition as derived relational responding, to address how verbal processes contribute to psychological inflexibility. Hayes' thinking continued to mature through integration with evolutionary science and broader contextual behavioral science (CBS). By the 1990s and , functional contextualism formalized as the philosophical backbone of , prioritizing processes that enhance human functioning over mechanistic causation, influencing shifts from protocol-based to process-based therapy. Collaborations, such as with evolutionary biologist in 2018, framed within an evolutionary metamodel, viewing psychological adaptation through multidimensional selectionism—cultural, biological, and symbolic—to predict and influence behavior more comprehensively. This evolution reflects Hayes' ongoing emphasis on pragmatic utility, as seen in his retirement from the in 2023 to lead the Institute for Better Health, focusing on scalable, evidence-based advancements.

Awards and Recognition

Major Honors and Their Significance

Steven C. Hayes received the Lifetime Achievement Award from the Association for Behavioral and Cognitive Therapies (ABCT) in 2007, recognizing his foundational role in advancing behavioral and cognitive therapies through the development of (ACT) and (RFT). This honor underscores the empirical validation of his contextual behavioral science approach, which integrates principles with clinical applications, evidenced by over 600 publications and ACT's inclusion in treatment guidelines by organizations like the . In 2022, Hayes was awarded the Regents' Career Distinguished Researcher Award by the Nevada System of Higher Education Board of Regents for his 36-year tenure at the University of Nevada, Reno, where he pioneered ACT as an evidence-based psychotherapy with demonstrated efficacy in randomized controlled trials across mental health domains. The award highlights the translational impact of his work, including RFT's contributions to understanding human language and cognition from a behavioral perspective, fostering innovations that extend beyond traditional cognitive-behavioral paradigms to emphasize psychological flexibility. Hayes earned the Exemplary Contributions to Basic Behavioral Research and Its Applications Award from Division 25 (Behavior Analysis) of the , affirming his success in linking experimental analyses of to practical therapeutic outcomes. This recognition signifies the rigor of his first-principles approach to deriving clinical methods from laboratory-derived processes, such as derived relational responding, which has influenced empirical studies on avoidance and strategies. In 2024, he received a Lifetime Achievement Award from the Association for Psychological Science, specifically honoring applied contributions in . This accolade reflects the broad scientific influence of his theories, as measured by high citation rankings—such as 63rd globally in psychology impact per Research.com data—and their role in challenging reductionist models while promoting process-based therapies supported by meta-analytic evidence. These honors collectively validate Hayes' emphasis on causal mechanisms rooted in behavioral principles, distinguishing his legacy from less empirically grounded psychological innovations.

Selected Works

Foundational Books and Papers

Hayes's development of (RFT) is grounded in the 2001 book Relational Frame Theory: A Post-Skinnerian Account of Human Language and , co-authored with Dermot Barnes-Holmes and Bryan Roche, which argues that human emerges from learned relational responding rather than innate rule-following or mental representations. This work synthesizes from behavioral experiments showing how arbitrary relations (e.g., "same," "opposite," "more than") are derived without direct , challenging traditional associative learning models. Earlier papers, such as Hayes and colleagues' explorations of derived stimulus relations, laid empirical groundwork, including demonstrations of equivalence classes and hierarchical framing in laboratory settings with human participants. The foundational text for Acceptance and Commitment Therapy (ACT) is the 1999 book Acceptance and Commitment Therapy: An Experiential Approach to Behavior Change, written with Kirk D. Strosahl and Kelly G. Wilson, which outlines ACT's core processes—acceptance, cognitive defusion, present-moment awareness, self-as-context, values, and committed action—as a means to enhance psychological flexibility amid experiential avoidance. This volume draws on RFT to explain how language exacerbates human suffering through rigid relational framing, supported by initial clinical data from outpatient settings showing reduced symptomology in anxiety and depression cases. Preceding this, Hayes's 1987 chapter "A Contextual Approach to Therapeutic Change" introduced proto-ACT elements, emphasizing functional analyses of avoidance over symptom reduction, based on case studies and behavioral principles. Subsequent compilations like The ACT in Context: The Canonical Papers of Steven C. Hayes (2015) aggregate over 30 key articles from 1982 to 2012, highlighting empirical validations such as randomized trials demonstrating ACT's efficacy in preventing rehospitalization among psychotic patients (e.g., Bach & Hayes, 2002, with 80% reduction in readmissions versus treatment as usual). These works collectively establish Hayes's shift from traditional behaviorism toward a contextualistic framework, prioritizing processes over protocols, with meta-analyses confirming moderate to large effect sizes across disorders (e.g., d = 0.68 for anxiety).

Recent Publications and Ongoing Projects

Hayes co-authored Beyond the DSM: Toward a Process-Based Alternative for Diagnosis and Mental Health Treatment in 2020 with Stefan G. Hofmann, proposing a framework that prioritizes dynamic psychological processes over traditional categorical diagnoses to enhance treatment personalization and efficacy. In 2021, he collaborated with Hofmann and David N. Lorscheid on Learning Process-Based Therapy: A Skills Training Manual for Targeting the Core Processes of Psychological Change in Clinical Practice, a practical guide equipping clinicians with tools to assess and intervene on evidence-based processes such as psychological flexibility, drawing from empirical data across cognitive-behavioral traditions. More recent scholarly contributions include Hayes's involvement in "Through the extended evolutionary meta-model, and what might become" published in the Journal of Contextual Behavioral Science in 2024, which extends to integrate evolutionary principles into therapeutic models for complex mental health challenges. Another 2024 publication, "Process-based : A common ground for understanding and utilizing therapeutic practices," appeared in September and synthesizes process-oriented strategies to unify disparate interventions under a single empirical . These works reflect Hayes's emphasis on idiographic, data-driven methods over protocol-based protocols, supported by meta-analyses of studies in interventions. Ongoing efforts center on evolving into broader process-based paradigms, including leadership in training initiatives like the "Reimagining ACT" workshops, with sessions held in in October 2025 and planned for in March 2026, focusing on integrating ACT with emerging evidence from and for adaptive clinical applications. Hayes also maintains active involvement in digital education through programs such as the ACT Immersion course, which delivers modular training on core processes via videos, exercises, and case examples to disseminate principles globally. These projects underscore his commitment to empirical validation, with ongoing collaborations testing process-based metrics in randomized trials for conditions like anxiety and .

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