Edward L. Deci is a Professor of Psychology and Gowen Professor in the Social Sciences at the University of Rochester, and director of its human motivation program. He is well known in psychology for his theories of intrinsic and extrinsic motivation and basic psychological needs.

Richard M. Ryan is a professor at the Institute for Positive Psychology and Education at the Australian Catholic University and a research professor at the University of Rochester. He earned his Ph.D. in clinical psychology from the University for Rochester and his B.A. from the University of Connecticut.

They co-developed Self-Determination Theory (SDT), one of the most influential theories of human motivation.

Self-determination theory (SDT) provides a framework for understanding the factors that promote motivation and healthy psychological and behavioral functioning. In this authoritative work, the codevelopers of the theory comprehensively examine SDT’s conceptual underpinnings (including its six mini-theories), empirical evidence base, and practical applications across the lifespan. The volume synthesizes a vast body of research on how supporting–or thwarting–people’s basic needs for competence, relatedness, and autonomy affects their development and well-being. Chapters cover implications for practice and policy in education, health care, psychotherapy, sport, and the workplace.

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Stumbling on Happiness
100 Things Every Designer Needs to Know about People
The Marshmallow Test
Becoming Brilliant