(1894–1956) Most influential American sex researcher of the 20th century. His research was unique and groundbreaking. In extensive live interviews, he and his team of researchers took thousands of case histories about the sex lives of women and men. No one else, before or since, has questioned such a huge sample of people so thoroughly about their sexuality. Although his sample did not precisely reflect the full range of diversity of the American people, he and his team provided us with important data from which we have learned a great deal.