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Clark Gregg received his bachelor of fine arts degree from NYU where he trained with David Mamet and William H. Macy. With them, he co-founded New York's famed Atlantic Theater Company, serving as one of the company's first artistic directors. He made his Off Broadway debut in Atlantic's production of Howard Korder's Boys' Life directed by Macy at the Lincoln Center Theater. He has appeared in numerous Broadway and Off Broadway productions, including A Few Good Men, The Old Boy, Unidentified Human Remains, Mojo and The Night Heron. He directed the acclaimed 1996 Off Broadway revival of Mamet's play, Edmond, and the New York and Los Angeles premieres of Distant Fires. He also created, co-wrote and directed the Los Angeles serialized play, The Big Empty.

Since moving to Los Angeles in the 1990s, Gregg has put together an impressive body of work in film and television. On television, Gregg played the recurring role of FBI liaison Agent Michael Casper on The West Wing. He has also appeared in The Shield, Will & Grace, Sport's Night, Sex and the City and The Practice. His television film credits include Tyson, Live from Baghdad and the upcoming romantic comedy The Road to Christmas, opposite his wife, Jennifer Grey.

His notable feature film work includes In Good Company, Spartan, Hoot, When a Stranger Calls, State and Main, Lovely and Amazing, 11:14, The Human Stain, We Were Soldiers, One Hour Photo, Northfork, Magnolia and The Adventures of Sebastian Cole, for which he was nominated for an Independent Spirit Award. He recently completed work on the upcoming films In the Land of Women and The Air That I Breathe.

Gregg is also an accomplished screenwriter. He made his screenwriting debut with What Lies Beneath and has written film scripts for Dreamworks, Universal, Fox and Warner Brothers.

Gregg lives in Los Angeles with his wife, Jennifer, and their daughter, Stella. His hometown is Cambridge, Massachusetts. His birth date is April 2.