Stanley H. Biber (May 4, 1923 – January 16, 2006) was an American physician who was a pioneer in sex reassignment surgery, performing thousands of procedures during his long career.
Biber was born to a Jewish family in Des Moines, Iowa as the older of two children and the only son of a father who owned a furniture store and a mother interested in social causes.
After giving up plans to become a pianist and rabbi, Biber served as a civilian employee with the Office of Strategic Services during World War II, stationed in Alaska and the Northwest Territory. After the war, he returned to Iowa and enrolled in school, with plans to become a psychiatrist.
Biber graduated from the University of Iowa medical school in 1948. He began performing surgery while in residency at a hospital in the Panama Canal Zone. Biber then joined the Army, where he was the chief surgeon of a Mobile Army Surgical Hospital (MASH) unit in the Korean War. He finished his service at what is now Fort Carson, Colorado, and in 1954 took a job at a United Mine Workers clinic in Trinidad, Colorado.
Biber performed his first sex change operation in 1969 after a transsexual woman asked him if he would be willing and able to do so. At first, he did not know how, but he learned by studying diagrams from Johns Hopkins. He kept his first few surgeries secret from the Catholic nuns who operated the hospital, due to concerns that they would react negatively. Trinidad subsequently became known as the "Sex Change Capital of the World" because of his renown.