John William Steffensen, born 30 August 1982 in Perth, Western Australia to South African immigrant parents, is an Australian athlete, who specialises in 200 and 400 metres. His personal bests are 20.79 and 44.73. Steffensen competed in the 2004 Olympics, and was a part of the Australian team that won the silver medal in 4 x 400 metres relay. Steffensen won the gold medal in the 400 m at the 2006 Commonwealth Games in Melbourne, with a time of 44.73, setting a new personal best. He decided to boycott the 2010 Commonwealth Games after a series of disputes with Athletics Australia, which he accused of mismanaging athletes. He won a second gold medal as the first runner in the 4 x 400 m Australian relay team at the 2006 Commonwealth Games. He is an old boy of Trinity College, Perth He is an old boy of Guildford Grammar School, Perth. He was runner up to Stephanie Rice in the 2013 Australian version of the television program Celebrity Apprentice. 

August 30th, 1982 in Perth (Age 42)