Peter Brett Cullen is an American actor. He is best known for his roles as Dan Fixx in Falcon Crest (1986–1988), Sam Cain in The Young Riders (1989–1990), Governor Ray Sullivan in The West Wing (2005–2006), Goodwin Stanhope in Lost (2005–2008), Mark Keeler in Make It or Break It (2009–2012), Nathan Ingram in Person of Interest, and Michael Stappord in Devious Maids (2013–2015).

Make It or Break It is an American teen/family drama television series that focused on the lives of teen gymnasts who strived to make it to the Olympic Games in 2012. The series was inspired by Touchstone's 2006 teen comedy-drama film Stick It. It premiered on ABC Family on June 22, 2009, with 2.5 million viewers.The series ended after Season 3. The show was picked up for an additional 10 episodes on July 27, 2009, which started airing on January 4, 2010, bringing the total number of episodes in the first season to 20. In January 2010, the show was renewed for a second season, which premiered on June 28, 2010 at 10 pm. Starting on July 13, 2010, new episodes aired following Pretty Little Liars. The show's second season resumed after a six-month hiatus on March 28, 2011. The series was renewed for a third season on September 16, 2011, which premiered on March 26, 2012. It was announced on April 26, 2012, that the series had ended and the third season would be the final season. The series finale aired on May 14, 2012.