He is best known on television for his role as Gino Primirola, the head barman, in the British television comedy drama Hotel Babylon. He also played Danny Pearce in The Bill from 1993 to 1995, and Neil in EastEnders in 2002, and he has appeared in Doc Martin alongside his real life brother John Marquez, The Catherine Tate Show, Murder Most Horrid, and Plastic Man.
He is also known for his theatre work, including Trevor Nunn's revival of Anything Goes in 2002, in which he played Moonface Martin and Terry Johnson's play Insignificance. He has performed as a comedy team, The Brothers Marquez, with his brother John Marquez, who also portrayed his fictional brother in a "Doc Martin" episode. He has played the lead role of Dad in Billy Elliot the Musical at the Victoria Palace Theatre in London's West End since November 2010.
Marquez first appeared on television in The Bill, where he portrayed Detective Sergeant Danny Pearce. He also had small roles in such series as Doc Martin, The Catherine Tate Show, Elizabeth I, The Business, EastEnders and Bedtime. From 2006 to 2009, he played the character of head barman on the television series Hotel Babylon. In 2013, he appeared in new ITV comedy drama The Job Lot, playing security guard Paul.
In October 2013, he went on to play the role of Captain Dana Holmes in From Here to Eternity the Musical.
