Raised in Totawa, New Jersey
At age 16, moved to NYC to pursue an acting career; adopted stage surname of "Spencer"
TV acting debut in a recurring role on "The Patty Duke Show" (ABC)
Was stage manager and understudy for lead role in a touring production of "Butterflies Are Free"
Was an understudy with the New York Shakespeare Festival's production of "Boom Boom Room" by David Rabe
Acted in regional theater with such companies as the Barter Theatre in Virginia, the Studio Arena Theater in Buffalo, New York and the Cincinnati Playhouse
Acted in the daytime dramas "Guiding Light" and "The Doctors"
Understudied John Rubinstein in the play "Children of a Lesser God"
Breakthrough stage role in "Still Life", a drama by Emily Mann
TV-movie debut, "Cocaine and Blue Eyes" (NBC), starring O.J. Simpson
Feature film debut in "WarGames"
Starred in the Broadway production of "Execution of Justice" by Emily Mann; played Dan White, the killer of San Francisco mayor George Moscone and Harvey Milk
Musical stage debut in "Carousel" at the Kennedy Center for the Performing Arts in Washington, DC
Supported Al Pacino in "Sea of Love"
Co-starred as a detective in "Presumed Innocent"
TV series debut as regular, played lawyer Tommy Mullaney on NBC's legal drama "L.A. Law"
Co-starred in the acclaimed "Cafe Society" (premiered on Showtime before receiving theatrical release)
Appeared as an FBI agent in "The Rock"
Had featured role in "Cop Land"
Returned to the NYC stage in "Pera Palas"
Acted in "Twilight" and "The Negotiator"
Returned to series TV as the patriarch of an Irish Catholic family in the short-lived NBC drama "Trinity"
Performed in Warren Leight's play "The Glimmer Brothers" at Williamstown Theatre Festival
Had featured role as presidential chief of staff Leo McGarry in the ensemble of the NBC drama series "The West Wing"; received Emmy (2000, 2001, 2003, 2004) and Golden Globe (2002) nominations
Acted in L.A. premiere of Warren Leight's revised play, now titles "Glimmer, Glimmer and Shine"; reprised role of a jazz musician in the Off-Broadway production in summer