Anne Fausto-Sterling is an American biologist and gender scholar who serves as the Nancy Duke Lewis Professor Emerita of Biology and Gender Studies at Brown University. Her groundbreaking work blends developmental genetics with feminist theory—and in essays like “The Five Sexes” she challenged the idea that biological sex is strictly binary. Her influential books, including Myths of Gender (1985) and Sexing the Body (2000), have helped reshape how scientists and the public think about sex, gender identity, and intersex variation.