JÃ rn Utzon ( born April 9 , 1918 , died November 29 , 2008 ) is a Danish architect who is most well known for designing the Sydney Opera House in Australia . JÃ rn Oberg Utzon , AC ( 9 April 1918 â `` 29 November 2008 ) was a Danish architect most notable for designing the Sydney Opera House in Australia .