José Aldo participates in UFC martial arts.
José Aldo da Silva Oliveira Junior ( [ ʒoˈzɛ ˈaldu ] ; born September 9 , 1986 ) is a Brazilian mixed martial artist in the Ultimate Fighting Championship and the UFC Featherweight Champion , currently in his second reign . He is currently a two-time UFC Featherweight Champion , having been promoted from interim champion in the wake of former champion Conor McGregor relinquishing the title on November 27 , 2016 . He is currently # 5 in official UFC pound-for-pound rankings , having been ranked as high as # 1 in 2015 , and ranked the # 2 featherweight in the world and # 8 pound-for-pound by Sherdog . In the decade between losses in November 2005 and December 2015 , Aldo was undefeated in 18 fights , before being defeated by Conor McGregor at UFC 194 .