Dr. Louis "Skip" J. Elsas (1937-2012) was born in Atlanta, Georgia, to Herbert (1910-1995) and Edith Elsas (1914-2010). He was a physician, researcher, and professor of biochemistry and genetics. In 1958 he graduated from Harvard University with a Bachelor in Science in Biochemistry, and in 1962 he received his Doctorate of Medicine, with honors, from the University of Virgina. He studied international medicine at Yale University, after which he became a faculty member for two years. In 1970 Dr. Elsas returned to Atlanta to establish the Division of Medical Genetics in the Department of Pediatrics at Emory University, where he published more than 190 articles on the topic. The International Olympic Committee (IOC) hired him to oversee gender verification for female athletes at the 1996 Atlanta Olympic Games. Dr. Elsas developed a multi-step DNA testing that determined an athlete's sex, thereby excluding cisgender male athletes masquerading as women from female-exclusive competitions, while reducing the chances of excluding intersex athletes from these events. The IOC stopped requiring gender testing in 1999. Dr. Elsas retired from Emory in 2005 andd in medical genetics at the University of Miami until his death.