Stipe Miocic (born August 19, 1982) is an American former professional mixed martial artist and currently works as a firefighter. He competed in the Heavyweight division of the Ultimate Fighting Championship (UFC), where he is a former two-time UFC Heavyweight Champion. Having successfully defended his title four times during his two title reigns, he holds the record for most wins in heavyweight title fights along with the longest title defense streak in the heavyweight division, at three consecutive defenses.
https://en.wikipedia.org/wiki/Stipe_Miocic