Peter J. Richerson

Peter J. Richerson is an American ecologist and geneticist, Distinguished Professor Emeritus at the University of California, Davis, and co-founder (with Robert Boyd) of dual inheritance theory — the mathematical and conceptual framework for understanding gene-culture coevolution. Trained in ecology and population genetics, Richerson brought rigorous quantitative methods to the study of cultural evolution, transforming what had been a field of metaphor and speculation into a predictive science.

Richerson's contributions span theoretical modeling, empirical research on cultural transmission in small-scale societies, and the application of evolutionary thinking to environmental policy. His work with Boyd demonstrated that cultural evolution operates through population-dynamic mechanisms analogous to genetic evolution — mutation, selection, drift, and migration — but with distinct properties that produce different outcomes. Culture can evolve faster than genes, can jump between unrelated individuals, and can accumulate maladaptive traits through conformity bias and prestige bias.

Beyond his collaboration with Boyd, Richerson has been a leading advocate for integrating evolutionary thinking into environmental science and policy. He argues that many contemporary environmental problems — overfishing, deforestation, climate inaction — are failures of cultural evolution: societies have cultural norms that were adaptive in the past but have become maladaptive in the context of globalized, industrial civilization.

The synthesizer's claim: Richerson's most underappreciated contribution is his insistence that cultural evolution is not merely a topic for anthropologists but a framework for understanding any system in which information is transmitted socially. The same models that explain why some societies adopt agriculture and others do not can explain why some scientific paradigms persist and others collapse. Culture is not a special case. It is a universal dynamic, and Richerson gave us the mathematics to study it.