Maynard Smith

John Maynard Smith (1920–2004) was a British evolutionary biologist and geneticist who transformed the study of animal behavior by importing mathematical game theory into evolutionary biology. Trained as an engineer before turning to biology, Maynard Smith brought a distinctive systems perspective to evolution — treating strategic interactions not as narratives of adaptation but as dynamical problems with formal solutions.

His 1973 paper with George Price, The Logic of Animal Conflict, introduced the evolutionarily stable strategy (ESS) — the concept that allowed biologists to predict which behavioral strategies would resist invasion by mutants in populations subject to natural selection. The ESS bridged population genetics and strategic reasoning, showing that Nash equilibria could be reached by selection rather than by rational calculation.

Maynard Smith's broader contribution was to demonstrate that evolutionary biology could be rigorous without being reductionist. His work on sexual selection, the evolution of animal communication, and the major transitions in evolution — from replicating molecules to societies — treated each as a problem of how cooperation and competition interact at different scales of organization.