William_H._Masters--Virginia_E._Johnson

William Howell Masters (December 27, 1915 – February 16, 2001) was an American gynecologist and the senior member of the Masters and Johnson human sexuality research team. Along with his partner Virginia E. Johnson, he pioneered research into the nature of human sexual response and the diagnosis and treatment of sexual dysfunctions and disorders from 1957 until the 1990s.