Mark O'Brien is a Canadian actor best known for his co-starring role as P.I. apprentice Des Courtney in the comedy-drama television series Republic of Doyle.
O'Brien is a native Newfoundlander who began his career at home performing improv and local theatre, before landing a break with the role of Drake in the CBC mini-series Above and Beyond.
His other screen credits include the Lifetime TV movie The One That Got Away, and a supporting role in the acclaimed feature film Grown Up Movie Star, which premiered at the 2010 Sundance Film Festival.
Mark has also appeared in a slew of award-winning short films, including Heartless Disappearance into Labrador Seas opposite New Waterford Girl's Liane Balaban.
His stage credits include Criminals in Love, Butler's Marsh, Poor Superman, Rope, Red Noses and Autobahn.