Notable for his role as Constable Matt Graham on the Australian television series Blue Heelers, Holmes is also known for his portrayals of Sam Webster and Swain Blake on, respectively, Out of the Blue and Sea Patrol.
Before making his screen debut, he trained at the Actors College of Theatre and Television.
He appeared in a television spot promoting an anti-drunk driving campaign sponsored by the state governments of Victoria and Queensland.
He spent his early days in Albury, New South Wales, Australia, and later attended Newington College, a boarding school located in Stanmore.
He and Tasma Walton are both known for their constable roles on Blue Heelers.