Cullen was born August 26, 1956, in Houston, Texas, the son of Catherine and Lucien Hugh Cullen, an oil industry executive and part of one of the most famous and wealthiest oil families in the oil-rich history of Texas.[2] He graduated from Madison High School in Houston in 1974,[3] subsequently attending the University of Houston from which he graduated in 1979. His alma mater awarded him a Distinguished Alumni Award in April 2012.
Cullen has given great credit to his highly acclaimed acting mentor and University of Houston professor, Cecil Pickett, who also mentored such Houston-born actors as Dennis Quaid, Randy Quaid, and Brent Spiner. Cullen and Dennis Quaid's close friendship, which continues to this day, dates back to the 1970s; it is Cullen who introduced Dennis Quaid to his former wife, Kimberly Buffington, at a dinner in Austin, Texas.
Career
Cullen played Dan Fixx in the 1980s CBS drama Falcon Crest for two seasons (1986–88) and Sam Cain in the ABCwestern series The Young Riders for one season (1989–90). In 1980, he appeared as the second Gideon Chisholm in the last nine episodes of the CBS western miniseriesThe Chisholms. In the four earlier episodes, the Gideon Chisholm role was played by Brian Kerwin. Cullen was the lead actor as Ned Logan in the short-lived Legacy, which lasted for just one season (1998–99). On the series The West Wing Cullen played Ray Sullivan, a fictional former U.S. attorney, state attorney general, and governor of West Virginia and the Republican nominee for vice president.
Cullen has found steady work in numerous television roles for many years. In addition to guest-starring roles in dozens of series, in 1983 he played Bob Cleary in the miniseries The Thorn Birds. In 1997, he was cast as Adam in a three-episode story arc on Suddenly Susan called "Love and Divorce American Style". The following year, he played love interest Luke Barton in the short-lived series The Simple Life opposite Judith Light. Later in 1998, the UPN television network gave him the starring role of family patriarch Ned Logan in the post-Civil War drama Legacy, which lasted 18 episodes before cancellation.
After 2000, he played small recurring roles in ABC's Once and Again, the low-rated series The Mountain, and as a detective in two episodes of Desperate Housewives. Cullen was awarded a meatier part on The West Wing in 2005–06, when he played West Virginia governor and vice presidential candidate Ray Sullivan. Later in 2006, he played a recurring role on Pepper Dennis, which was cancelled after its first season as well. He played a short-lived love interest of Vanessa Williams' Wilhelmina Slater on Ugly Betty in early 2007, and followed that up with a story arc as dad Walt Riggins on Friday Night Lights. Cullen had recurring roles in the series Lost,[5]Damages, and The Gates between 2007 and 2010.
From 2011–16, Cullen played the flashback character Nathan Ingram on the hit series Person of Interest.[6] He also plays Mark Keeler, father of Olympic gymnast hopefuls Payson and Becca Keeler, on the ABC Family series Make It or Break It.[7]
On February 8, 2011, Cullen was named the official spokesman for Houston Works which helps Houston residents with job training and placement, scholarships, consulting, technical initiatives focusing on science, technology, engineering and mathematics and summer job programs along with Youth Summits.[8]