Steven C. Hayes

Who Is Steven Hayes?

Steven C. Hayes is an American clinical psychologist, professor, and one of the most influential behavioral scientists of his generation. He is the creator of Acceptance and Commitment Therapy (ACT), a form of psychotherapy that helps people develop psychological flexibility — the ability to contact the present moment, accept difficult thoughts and feelings, and take action guided by personal values.

Hayes is also the developer of Relational Frame Theory (RFT), a comprehensive account of human language and cognition that provides the scientific foundation for ACT. Together, ACT and RFT represent one of the most significant developments in behavioral psychology since B.F. Skinner, offering a new way to understand why humans struggle and what enables them to thrive.

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Early Life and Education

Steven Hayes was born in 1948 and grew up in California. He earned his PhD in clinical psychology from West Virginia University in 1977, where he was trained in the behavior analytic tradition — a rigorous, experimental approach to understanding human behavior rooted in the work of B.F. Skinner.

Early in his career, Hayes experienced a series of panic attacks that were severe enough to disrupt his professional functioning. This personal experience with anxiety became a turning point. He noticed that his attempts to control and eliminate the panic actually made it worse. This observation — that the strategies people use to avoid psychological pain often increase suffering — became a central insight that would shape ACT.

Hayes joined the faculty at the University of Nevada, Reno, where he has remained as Foundation Professor of Psychology. Over his career, he has authored over 50 books and 700 scientific articles, making him one of the most prolific psychologists in the world.

Key Contributions

Hayes's two major contributions — Relational Frame Theory and Acceptance and Commitment Therapy — are deeply intertwined. RFT came first and provides the basic science; ACT is the applied clinical model built on that foundation.

Relational Frame Theory (RFT) is a behavioral account of human language and cognition. It proposes that the ability to relate events to one another — to see one thing as similar to, different from, better than, or causally connected to another — is a learned behavior that is at the core of human intelligence. This same ability, however, creates the conditions for human suffering. Because we can relate events symbolically, we can re-experience past trauma through memory, anticipate future disasters through worry, and evaluate ourselves harshly through comparison. Language, in the RFT view, is both humanity's greatest gift and the source of unique psychological pain.

Acceptance and Commitment Therapy (ACT) builds directly on these insights. If language and cognition naturally produce suffering, then trying to eliminate negative thoughts and feelings is a losing battle. Instead, ACT teaches six core processes that together produce psychological flexibility:

1. Acceptance — willingness to experience difficult thoughts and feelings without trying to eliminate them
2. Cognitive Defusion — learning to observe thoughts as mental events rather than literal truths
3. Present Moment Awareness — contacting the here and now rather than being lost in past or future
4. Self-as-Context — connecting with a sense of self that is stable and observing, distinct from one's changing thoughts and emotions
5. Values — clarifying what matters most and what kind of life one wants to build
6. Committed Action — taking concrete steps in the direction of one's values, even in the presence of discomfort

The ACT model is often represented as a hexagonal diagram (the "hexaflex"), showing how these six processes interact. Psychological inflexibility — the opposite of each process — is what ACT views as the root of most psychological problems.

How His Work Changed Therapy

Hayes's work has changed therapy in several fundamental ways. First, ACT challenged the assumption shared by most cognitive and behavioral therapies that the primary goal of treatment is to reduce symptoms. In ACT, the goal is not to eliminate anxiety, sadness, or unwanted thoughts but to change a person's relationship with those experiences so they no longer control behavior. A person can have anxious thoughts and still take meaningful action.

This shift — from symptom reduction to valued living — represented a philosophical departure that influenced the entire field. It helped move the conversation from "What's wrong with you?" to "What matters to you?"

Second, Hayes helped establish the "third wave" of behavioral therapies. The first wave was classical behaviorism (Pavlov, Skinner); the second was the cognitive revolution (Beck, Ellis). The third wave, which includes ACT, DBT, and mindfulness-based approaches, integrates acceptance, mindfulness, values, and relationship processes into the behavioral tradition. Hayes was one of the first to articulate this third-wave framework.

Third, Hayes championed the development of process-based therapy — the idea that treatment should target specific psychological processes (like experiential avoidance or cognitive fusion) rather than diagnostic categories. This approach emphasizes personalized treatment and has influenced how researchers think about therapy outcomes and mechanisms of change.

The evidence base for ACT is substantial. Hundreds of randomized controlled trials support its effectiveness across a wide range of conditions, including anxiety, depression, chronic pain, substance use, psychosis, and workplace stress. ACT has also been applied outside clinical settings in organizational behavior, coaching, sports psychology, and education.

Core Ideas and Principles

At the heart of ACT is the concept of psychological flexibility — the ability to be open to experience, present in the moment, and guided by what matters most. Hayes argues that psychological inflexibility — the tendency to avoid uncomfortable experiences, fuse with unhelpful thoughts, lose contact with the present, and act based on fear rather than values — is a transdiagnostic process underlying most forms of human suffering.

Experiential avoidance is a key concept. It refers to the attempt to avoid, suppress, or escape unwanted internal experiences such as thoughts, feelings, memories, and sensations. While avoidance sometimes works in the short term, Hayes's research shows that it tends to amplify suffering over time. The person who avoids anxiety-provoking situations becomes more anxious; the person who suppresses painful memories finds they intrude more forcefully.

ACT's alternative is not passive acceptance but active willingness — choosing to make room for difficult experiences when doing so serves one's values. A person with social anxiety, for example, might learn to attend a social event while feeling anxious, because connection is something they value.

Values serve as the compass in ACT. Unlike goals, which can be achieved and checked off, values are ongoing directions — like "being a caring parent" or "contributing to my community." ACT helps people clarify their values and take committed action toward them, creating a sense of purpose and vitality even amid suffering.

Legacy and Modern Practice

Steven Hayes continues to be one of the most active and influential figures in clinical psychology. ACT has grown from a niche behavioral approach into one of the most widely practiced and researched therapies in the world, with practitioners in over 100 countries and training programs offered through the Association for Contextual Behavioral Science (ACBS), which Hayes co-founded.

His influence extends well beyond the therapy room. ACT principles have been adopted in organizational psychology, where they are used to improve workplace well-being and performance. Schools have implemented ACT-based programs to support student mental health. Public health initiatives have used ACT to promote behavior change in areas like chronic disease management and smoking cessation.

Hayes's more recent work focuses on process-based therapy, which aims to identify the specific mechanisms of change that operate across different therapeutic approaches. This represents a move away from brand-name therapy models and toward a more unified, evidence-based understanding of what actually helps people change.

His book A Liberated Mind (2019) brought ACT principles to a general audience, making psychological flexibility accessible to people outside the therapy context. His TED talks and public speaking continue to reach millions.

The contextual behavioral science community that Hayes helped build represents one of the most vibrant and productive research communities in psychology, with thousands of researchers and clinicians advancing the understanding of how language, cognition, and context shape human behavior.

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