About
Peter Gallagher is an American actor with a career spanning several decades in film, television, and theater. He gained widespread recognition for his role as Sandy Cohen in the television drama series *The O.C.* Gallagher has also had notable roles in films like *American Beauty* and *While You Were Sleeping*. In addition to his screen work, he has had a successful career in musical theater, starring in Broadway revivals of *Guys and Dolls* and *On the Twentieth Century*.
Career Timeline
Broadway Debut
Begins acting career with theater roles, including Broadway.
"Sex, Lies, and Videotape"
Gains recognition for role in indie film.
"The O.C." Breakthrough Role
Breakthrough role as Sandy Cohen elevates his profile.
"Californication" Recurring Role
Appears in the popular TV show, gaining further exposure.
"Law & Order: SVU" Role
Lands recurring role in the long-running TV series.
"Grace & Frankie" Series Regular
Becomes a series regular in the comedy show.
Continued TV Roles
Continues to appear in various TV shows, staying active.
Versatile Acting Career
Maintains a steady career across TV, film, and theater.
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Last updated: February 25, 2026