Dan O'Brien

Actor Dan O'Brien has been quietly building a career since he graduated from Notre Dame in 1999. He began, like most actors, with small parts on TV shows such as "Law & Order" (2006) and in the Sarah Jessica Parker vehicle "Spinning Into Butter" (2008). He also paid the bills voicing the video game "Grand Theft Auto IV" and appeared in the low-budget 2010 comedy feature "Below the Beltway." In 2011, after a few more TV guest roles, O'Brien got the chance to portray a character on the buzz-worthy sitcom "Whitney," starring comedian Whitney Cummings. O'Brien plays Mark on the show, best friend of main character Alex Miller.