Edward L. Deci, a pioneering American psychologist renowned for his groundbreaking work on human motivation and co-founding Self-Determination Theory, passed away peacefully on February 14, 2026, at the age of 83. A distinguished professor at the University of Rochester, Deci's research profoundly reshaped our understanding of intrinsic and extrinsic motivation, leaving an indelible mark on fields ranging from education and healthcare to organizational behavior.

Born on October 14, 1942, in Palmyra, New York, Deci embarked on an impressive academic journey. He earned his Bachelor of Arts in Mathematics from Hamilton College in 1964, followed by an MBA from the Wharton School at the University of Pennsylvania in 1967. His intellectual curiosity led him to pursue a PhD in Social Psychology from Carnegie Mellon University, which he completed in 1970, laying the foundation for his lifelong dedication to understanding human drive.

Deci joined the University of Rochester faculty in 1970, where he became the Helen F. and Fred H. Gowen Professor in the Social Sciences and directed the Human Motivation Program. It was here, in collaboration with Richard Ryan, that he developed Self-Determination Theory (SDT), a macro theory of motivation emphasizing the innate psychological needs for autonomy, competence, and relatedness. Their seminal 1985 book, "Intrinsic Motivation and Self-Determination in Human Behavior," formalized SDT, challenging prevailing behaviorist views by demonstrating how external rewards could undermine internal drive.

Throughout his illustrious career, Deci authored numerous influential books and hundreds of publications, translated into multiple languages, and lectured globally. His contributions earned him significant accolades, including the Distinguished Scholar Award from the Society for Personality and Social Psychology and a Lifetime Achievement Award from the International Society for Self and Identity. He retired as Professor Emeritus from the University of Rochester in 2017, but his intellectual legacy continued to inspire.

Beyond his academic pursuits, Deci also served as the Director of the Monhegan Museum in Monhegan, Maine, reflecting his diverse interests and commitment to community. His passing is a significant loss to the scientific community and countless individuals whose lives were positively impacted by his profound insights into what truly motivates human flourishing.