Edward L. Deci, Self-Determination Theory Co-Founder, Dies at 83

Edward L. Deci, known for his work in psychology, died on February 14, 2026, at the age of 83. His research contributed to the understanding of human motivation through Self-Determination Theory.

Deci was born on October 14, 1942, in Palmyra, New York. He held the position of Professor of Psychology and Gowen Professor in the Social Sciences at the University of Rochester, where he also directed the Human Motivation Program.

Throughout his career, Deci focused on the study of motivation and well-being. He collaborated with Richard M. Ryan to develop Self-Determination Theory, which examines the roles of intrinsic and extrinsic motivation in human behavior.

Self-Determination Theory identifies autonomy, competence, and relatedness as essential psychological needs. According to the theory, these elements are fundamental for motivation and personal well-being.

What the numbers show

• Deci was born in 1942 and died in 2026
• He was 83 years old at the time of his death
• His 1971 study addressed the effects of monetary rewards on motivation

Deci’s research in 1971 explored how external rewards, such as money, can influence voluntary engagement in activities. Psychology Today noted that his findings challenged existing behaviorist perspectives by showing that monetary incentives might decrease intrinsic motivation.

In his academic roles, Deci contributed to the development of programs focused on human motivation at the University of Rochester. His work, especially in collaboration with Ryan, has been referenced in studies on psychological needs and motivation.

Deci’s contributions to psychology are recognized for shaping theories related to motivation and well-being. The concepts established in Self-Determination Theory continue to be cited in research and educational contexts.

* This article is based on publicly available information at the time of writing.