Greg Louganis dominated world diving competitions in the 1980s, scoring double gold medals in back-to-back Olympic Games. But a more meaningful triumph came years later, when he revealed to the public that he was both gay and HIV-positive and became an advocate for human rights. He now mentors top U.S. divers.

A version of this article appeared in the July–August 2016 issue (p.136) of Harvard Business Review.