Anke A. Ehrhardt is a researcher in the field of sexual and gender development of children, adolescents, and adults. Her research has included a wide range of studies on determinants of sexual risk behavior among children, adolescents, heterosexual women and men, and the gay population, and on comprehensive approaches to preventing HIV and STD infection. Ehrhardt is the Founding Director of the HIV Center for Clinical and Behavioral Studies at the New York State Psychiatric Institute and Columbia University, where she has had a particular focus on research and advocacy for female-controlled methods of HIV prevention.