Harry Benjamin

German-American-Jewish endocrinologist and sexologist, widely known for his clinical work with transsexualism. Benjamin's 1966 book, The Transsexual Phenomenon, was immensely important as the first large work describing and explaining the affirmative treatment path he pioneered. Publicity surrounding his patient Christine Jorgensen brought the issue into the mainstream in 1952 and led to a great many people presenting for assistance, internationally.

Benjamin received his doctorate in medicine in 1912 in Tübingen, Germany for a dissertation on tuberculosis. Sexual medicine interested him, but was not part of his medical studies.

Benjamin visited the United States in 1913, to work with a doctor who claimed, incorrectly, to have found a cure for tuberculosis. The liner in which Benjamin was returning to Germany was caught mid-Atlantic both by the outbreak of the First World War in 1914, and the Royal Navy. Given the choice of a British internment camp, as an "enemy alien", or returning to New York, he used his last dollars to travel back to America, where he made his home for the rest of his life.

In 1948, in San Francisco, Benjamin was asked by Alfred Kinsey, a fellow sexologist, to see a child who "wanted to become a girl" despite being born male; the mother wished for help that would assist rather than thwart the child. Kinsey had encountered the child as a result of his interviews for Sexual Behavior in the Human Male, which was published that year. Kinsey and Benjamin had seen nothing of the like previously. This child rapidly led Benjamin to understand that there was a different condition to that of transvestism, under which adults who had such needs had been classified to that time.