<Tr> <Th> 2007--2008 </Th> <Td> FSu </Td> </Tr> <Tr> <Th> Website </Th> <Td> hafthorbjornsson.com </Td> </Tr> <P> Hafþór Júlíus Björnsson (Icelandic pronunciation: ​ (ˈhafθour ˈjuːliʏs ˈpjœsːɔn); born November 26, 1988) is an Icelandic professional strongman and actor . He is the current World's Strongest Man and is the first person to have won the Arnold Strongman Classic, Europe's Strongest Man and World's Strongest Man in the same calendar year . He plays Gregor "The Mountain" Clegane in the HBO series Game of Thrones . He also is a former professional basketball player . </P> <P> Born in Reykjavík, Hafþór began his basketball career in 2004 with Division I team Breiðablik, moving to FSu in 2005 . He transferred to Premier League side KR in 2006 before returning to FSu in 2007 . He helped FSu to promotion from Division I to the Premier League but his career was cut short in 2008 due a recurrent ankle injury . He subsequently began his strongman career . </P>

Who plays gregor clegane on game of thrones