Presents an obituary for Seymour (Sy) Epstein, who passed away in Amherst on May 20, 2016. Epstein was a significant voice in personality psychology for more than six decades. His wide-ranging, programmatic research addressed cognitive mediation of classical conditioning, stress and coping, the self-concept, drive, conflict, and psychopathology. His research on aggregation strongly influenced the person-situation debate. His most important contribution was his decades-long development of an integrated personality theory, culminating in his magnum opus, Cognitive-Experiential Theory (Oxford University Press, 2014). (PsycINFO Database Record