Dermot Mulroney was first seen in the 1987 television drama film ‘Sin of Innocence’ directed by Arthur Allan Seidelman. In 1988, he made his first big-screen appearance in the American crime mystery Western film ‘Sunset’ directed by Blake Edwards. The film was panned by critics and was a commercial failure. The same year, he also portrayed ‘Dirty Steve Stephens’ in the Christopher Cain-directed American biographical Western film ‘Young Guns.’ While the film opened to a mixed critical reception, it performed well at the box office and grossed over $56 million on a budget of $11 million. He next appeared in films like ‘Staying Together’ (1989), ‘Longtime Companion’ (1989), ‘Bright Angel’ (1990), ‘Career Opportunities’ (1991), ‘Where the Day Takes You’ (1992), ‘Point of No Return’ (1993), ‘The Thing Called Love’ (1993), ‘Bad Girls’ (1994), ‘Angels in the Outfield’ (1994), ‘Copycat’ (1995), ‘Living in Oblivion’ (1995), ‘Kansas City’ (1996), ‘The Trigger Effect’ (1996), ‘My Best Friend's Wedding’ (1997), ‘Goodbye Lover’ (1999), ‘Trixie’ (2000), ‘Where the Money Is’ (2000), ‘The Safety of Objects’ (2001), and ‘Investigating Sex’ (2001). In 2002, he starred as ‘Randall Hertzel’ in the American comedy-drama film ‘About Schmidt’ directed by Alexander Payne. The film earned praise from critics and was a commercial success, grossing over $105.8 million on a $30 million budget. In 2004, he played the role of ‘John Munn’ in the American psychological thriller film ‘Undertow’ directed by David Gordon Green. The film received a mixed response from critics and holds a 55% approval rating on Rotten Tomatoes.
Mulroney continued to star in films like ‘The Wedding Date’ (2005), ‘The Family Stone’ (2005), ‘Griffin & Phoenix’ (2006), ‘Dante's Inferno’ (2007), ‘Zodiac’ (2007), ‘Gracie’ (2007), ‘Jolene’ (2008), ‘Flash of Genius’ (2008), ‘Inhale’ (2010), and ‘Abduction’ (2011). In 2011, he portrayed ‘Colonel Schwarzkopf’ in the American biographical drama film ‘J. Edgar’ directed by Clint Eastwood. The film opened to a mixed critical reception and grossed over $84.9 million on a budget of $35 million. He next starred in films like ‘Struck by Lightning’ (2012), ‘The Grey’ (2012), ‘Space Warriors’ (2013), ‘Stoker’ (2013), ‘Jobs’ (2013), ‘Truth’ (2015), ‘Insidious: Chapter 3’ (2015), ‘Dirty Grandpa’ (2016), and ‘Sleepless’ (2017). In 2017, he starred as ‘Mark Robertson’ in the American drama film ‘The Mountain Between Us’ directed by Hany Abu-Assad. The film received a mixed response from critics and holds a 38% approval rating on Rotten Tomatoes. He was next seen in films such as ‘I Still See You’ (2018), ‘Cats and Peachtopia’ (2018), ‘Sgt. Will Gardner’ (2019), ‘Hard Luck Love Song’ (2020), ‘The Blazing World’ (2021), ‘Christmas Is Cancelled’ (2021), ‘Along for the Ride’ (2022), and ‘Umma’ (2022). He last appeared in the 2022 American spy action-thriller film ‘Agent Game’ directed by Grant S. Johnson. The film received mostly negative reviews from critics.