Tristan John Gemmill (born 6 June 1967) is an English actor, most notable for his roles as Dr Adam Trueman on Casualty, and Robert Preston in Coronation Street. He was educated at Holmewood House School, Royal Tunbridge Wells, Kent, up to the age of 13. He then won an Academic Scholarship to Tonbridge School.

Filmography

• Agatha Christie's Seven Dials — Doctor Jackman
• Twenty Twenty Six — Daniel Krassman
• 2025An Enemy Within — William Wingate
• Citadel — Banker
• The Crown — Dr Richard Thompson
• Father Brown — Inspector Neil Beckett
• 2013Flying Blind — Robert
• 2013The Adventurer: The Curse of the Midas Box — Isambard Black
• Call the Midwife — Clifford Raines
• Death in Paradise — Marc Campese
• The Case — Sol Ridley
• Meadowlands — David York
• 2006Hannibal: Rome's Worst Nightmare — Varro
• Mayo — Lawrence Davis
• Distant Shores — Duncan McCallister
• The Golden Hour — Sgt Jim Travis
• 2005The Jacket — Officer Nash
• 2004Gladiatress — Firmus
• Celebrity Mastermind
• Red Cap
• 2003The Gospel of John — Andrew
• 2003The Life of Jesus — Andrew
• Judge John Deed — Dr. David Barbara
• 1999Nancherrow — Walter
• Nancherrow
• Trial & Retribution — Meadows, Actor
• Agatha Christie's Poirot — Major Despard
• Casualty — Adam Trueman
• Winston Churchill: The Wilderness Years — Schoolboy

Appearances as themselves (2)

• 2013Comet: A Great British Air Disaster — Self - Narrator (voice)
• Loose Women — Self