Mark Colvin joined the ABC as a cadet journalist. He then spent three years as a founding member of Australia's first youth station, 2JJ (now Triple-J), before a two-year stint as a news producer and current affairs reporter.
He was London and European correspondent for the ABC for most of the 80s and 90s before joining Four Corners for five years before returning to London. He returned to Australia as presenter of PM in 1997, a job he has continued to do despite three years on dialysis and a successful kidney transplant.
Since 2009, he has gradually built himself as one of the best-known journalistic names on Twitter, which he uses as a conversation, a way to find and double-check stories, and a source of amusement.