For Keith's role in Four, he was nominated in 2002 for the Drama Desk Nomination for Outstanding Featured Actor (Play) but was also nominated and won the Lucille Lortel Award for Outstanding Featured Actor.
In October 2002, Keith played the role of Evan in Going Native by Steven Drukman at the Long Wharf Theater Stage II, New Haven, Connecticut.
In June 2002, Keith had a role to play in Free to Be You and Me by Marlo Thomas at the Greenwich House, New York City, New York.
In March 2005, Keith played the role of Bernard in Romance by David Mamet at the Atlantic Theater Company, New York City, New York.
Keith initially auditioned for the role of Jimmy Donnelly on The Black Donnellys, but did not get the part. He then auditioned for the role of Joey Ice Cream and got that part.
He made his debut on television in 1999 in the TV series The Sopranos.
In 2003, appeared in the "Free Pizza Day" commercials for Domino's Pizza.
He appeared in Christopher Shinn's play Four.
Keith attended the prestigious High School for the Performing Arts in NYC. He graduated in 1997 as a drama major.