Tom O'Sullivan is an Australian television, film and theatre actor. O’Sullivan was born in Perth, Western Australia, and later relocated to Sydney to study at the National Institute of Dramatic Art where he graduated in 2003. His first television role was a guest role on the soap opera Home and Away and was followed by playing Tom Huppatz in the ABC TV mini-series Rain Shadow. In 2010, O'Sullivan played Sean 'Grunter' Sinclair in the crime drama Underbelly: The Golden Mile and joined the main cast of Nine Network drama Cops LAC playing Senior Constable Nathan Holt. He has also portrayed William Chambers in the TVNZ 1 drama When We Go To War and Michael Shrimpton in the Seven Network drama series Molly.

Filmography