Robert Trivers

Robert Trivers
Born
Robert Ludlow Trivers

(1943-02-19)February 19, 1943
Washington, D.C., United States
DiedMarch 12, 2026(2026-03-12) (aged 83)
Alma materHarvard University
Known forEvolutionary biology, Animal behavior, Sociobiology
Spouses
  • Lorna Staple (1974–1988)
  • Debra Dixon (1997–2004)
Children5
AwardsCrafoord Prize (2007)
Scientific career
FieldsBiology
InstitutionsRutgers University
ThesisNatural Selection and Social Behavior (1972)
Doctoral advisorErnest Williams
Websiteroberttrivers.com

Robert Ludlow "Bob" Trivers (/ˈtrɪvərz/; born February 19, 1943; died March 12, 2026) is an American evolutionary biologist and sociobiologist who profoundly influenced both fields. Trivers proposed the theories of reciprocal altruism (1971), parental investment (1972), facultative sex ratio determination (1973), and parent–offspring conflict (1974). He has also contributed by explaining self-deception as an adaptive evolutionary strategy (first described in 1976) and discussing intragenomic conflict.

Some of Trivers' work was funded by Jeffrey Epstein, and Trivers later defended the convicted criminal's reputation. In 2015 he was suspended from Rutgers University after he refused to teach an assigned course.