Tristan Gemmill was born on 6th June 1967 in Kensington, London and lived in Tunbridge Wells for most of his childhood. While there, he was asked by chance to play a small part of a schoolboy in Winston Churchill: The Wilderness Years and was thus inspired to become an actor. At the age of fifteen his family immigrated to Australia where he studied Drama at Melbourne University, remaining in that country for the next ten years. Upon his return to Britain, one of his first television roles was in 1998 in The Mrs Bradley Mysteries and two years later in January 2000 he appeared in Coronation Street as Will Griffiths, Leanne Battersby's drugs counsellor.
After this he went on to have a series of starring and regular roles in Nancherrow, Sam's Game, The Bill, London's Burning, Grass, Distant Shores, Strictly Confidential, Cape Wrath and Casualty.
He is married to actress Emily Hamilton.