His feature film debut came in 1980 with a role in Taylor Hackford's The Idolmaker. Gallagher's also appeared in American Beauty, starring Kevin Spacey and Annette Bening; his other film credits include The Man Who Knew Too Little with Bill Murray, Johnny Skidmarks, To Gillian on Her 37th Birthday, the comedy hit While You Were Sleeping, Malice, The Hudsucker Proxy (on which he worked with producer Joel Silver), The Player, Short Cuts, Mrs. Parker and the Vicious Circle and sex, lies and videotape. Gallagher recently completed City Ballet, directed by Nicholas Hytner.
His most notable stage roles include his performance as Sky Masterson in the Tony-nominated revival of Guys and Dolls, A Doll's Life, Tom Stoppard's The Real Thing, and Pal Joey. He also earned a Tony nomination for his performance opposite Jack Lemmon in Long Day's Journey Into Night.
On television, Gallagher has starred in numerous cable and network films such as HBO's Path to Paradise, Showtime's Fallen Angel series, The Quiet Room and Cafe Society. Other credits include the Emmy and Peabody Award-winning miniseries The Murder of Mary Phagan, The Caine Mutiny Court Marshal, The Titanic, Host, Brave New World and the ABC series The Secret Lives of Men.
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