Serge Voronoff
Serge Abrahamovitch Voronoff (Russian: Сергей Абрамович Воронов; c. July 10, 1866 – September 3, 1951) was a French surgeon of Russian origin who gained fame for his practice of xenotransplantation of monkey testicle tissues onto the testicles of men, purportedly as an anti-aging therapy while working in France in the 1920s and 1930s.