When Harry Became Sally provides thoughtful answers to questions arising from our transgender moment. Drawing on the best insights from biology, psychology, and philosophy, Ryan Anderson offers a nuanced view of human embodiment, a balanced approach to public policy on gender identity, and a sober assessment of the human costs of getting human nature wrong.

The transgender movement has hit breakneck speed. In the space of a year, it’s gone from something that most Americans had never heard of to a cause claiming the mantle of civil rights.