He hosted "A Current Affair" from 1994 to 1998 and went on to present three series – "Our Century", "The Great Debates" and "Simply the Best" – before returning to "60 Minutes" to do special reports. In 2003 he resumed as host of "A Current Affair". It was announced in December 2005 that he would become the Nine Network's Senior Reporter. This quashed much speculation that he would return to "Four Corners" at the ABC, as the fluctuating ratings for "A Current Affair" had decreased. Over the past few years he has assisted in reporting with some major events including the Indonesian tsunami disaster in 2005. Former "Today Show" co-host Tracy Grimshaw replaced Martin on "ACA" at the beginning of 2006. He was then a senior correspondent for Channel Nine.