Leo Wollman
From GenderWiki
Leo Wollman (1914–1998) was a physician specializing in the treatment of gender identity issues from the 1960s through the 1980s. He practiced in New York City with a primary office in Coney Island, Brooklyn.
Dr. Wollman was a founding member of the Harry Benjamin International Gender Dysphoria Association, and one of the co-authors of the first four editions of the Benjamin Standards of Care.