Serge (Samuel) Voronoff was born to a Jewish family in the village Shekhman, Tambov Governorate in Russia (now Tambov Oblast) shortly before July 10, 1866, the date of his circumcision in a synagogue. His father Abram Veniaminovich Voronov was a former cantonist and a distiller; his mother was Rachel-Esther Lipsky. At the age of 18, after graduating from the Voronezh Realschule, he emigrated to France, where he studied medicine. In 1895 at the age of 29, Voronoff became a naturalized French citizen. Voronoff was a student of French surgeon, biologist, eugenicist, and Nobel Prize recipient Alexis Carrel, from whom he learnt surgical techniques of transplantation. Between 1896 and 1910, he worked in Egypt, studying the retarding effects that castration had on eunuchs, observations that would lead to his later work on rejuvenation.