ANDREAS KRIEGER won a gold medal in the shot put for East Germany as Heidi Krieger before undergoing sex reassignment surgery in 1997.
BALIAN BUSCHBAUM was born Yvonne Buschbaum and competed for Germany in the pole vault before undergoing gender reassignment in 2007.
ERIK SCHINEGGER was a world champion skier known as Erika before IOC medical tests determined that he was male, which led to his decision to live as a man.
JAIYAH SAELUA was the first transgender player to compete in a men's World Cup qualifier for American Samoa.
KYE ALLUMS played on the George Washington University women's basketball team as Kay-Kay Allums, but now identifies as a male.
MIANNE BAGGER was born male, but won golf tournaments as a female in 1999, 2001-02. Bagger's efforts helped open doors for transgender athletes to compete in major tournaments around the world.
MICHELLE DUFF was born Michael, but won races as a Grand Prix motorcycle racer as a woman.
MICHELLE DUMARESQ competes in pro downhill mountain bike races following her sex reassignment surgery in 1996.
PARINYA CHAROENPHOL was born a male but has gained fame in Thailand as a fermale Muay Thai boxing champion.
PETER WHERRETT was an Australian race car driver and journalist. After separating from his third wife in 2006, Wherrett lived as a woman before dying from cancer in 2009.
RENEE RICHARDS was a pro tennis player who underwent reassignment surgery in 1975. After being denied entry into the 1976 U.S. Open, Richards challenged the ruling and had the ban reversed. As a woman, Richards was ranked as high as 20th on the women's tour.
ROBERT COWELL raced as Robert Cowell before becoming the first known British citizen to undergo reassignment surgery. Cowell continued to be involved in auto racing as a female.