Gallagher has continued a steady acting career over the past few decades. You probably know him as Sandy Cohen on The O.C., Nick Skolka on Grace and Frankie, or Mitch Clarke on Zoey's Extraordinary Playlist, but his resume is much more than just a few buzzy screen roles. He's a Tony-nominated stage actor and has a slew of both movie and TV credits to his name. He's not the only performer in his family, either: daughter Kathryn Gallagher is a Broadway actress currently in Jagged Little Pill.