He is a child psychiatrist working in private practice and with LGBTI foster children. He received his PhD in the History of Science from Harvard University, and his MD from the Harvard Medical School-MIT Program in Health Sciences and Technology. He is the editor of Science and Homosexualities (1997) and guest editor of a special volume on intersexuality, Journal of Gay & Lesbian Psychotherapy (2006). He is the author of The Erotic Imagination: French Histories of Perversity (1997) and Homosexuality and Science: A Guide to the Debates (2002). His current research interest is in transgender and intersex children and adolescents.