Huffington Post: Jason Collins, a free agent who played with the Boston Celtics and the Washington Wizards during the National Basketball Association’s 2012-13 season, made history on April 29 when he became the first male professional athlete currently playing in the United States to announce he’s gay.

Though this is a monumental event for the sports and lesbian, gay, bisexual and transgender communities, many other athletes have come out of the closet in the past.

Read more and see Johnny in the slideshow here.