<Tr> <Th> Years active </Th> <Td> 2005--present </Td> </Tr> <Tr> <Th> Spouse (s) </Th> <Td> Georgina Reilly (2013--present) </Td> </Tr> <P> Mark O'Brien (born May 7, 1984) is a Canadian actor and director . He is best known for playing the role of Des Courtney in Republic of Doyle and Tom Rendon in Halt and Catch Fire . </P> <P> O'Brien married fellow CBC network star Georgina Reilly on January 6, 2013, after having met on the set of the show in 2011 . </P>

Who plays tom on halt and catch fire