In 1999 Welch appeared in
NBC’s Third Watch. He later appeared in the television series
Law & Order: Special Victims Unit, the short film
Custody, and the television film
Hamlet. He then appeared in an episode each of
The Practice,
Law & Order: Criminal Intent, and
Whoopi. Welch had an extensive stage career. He appeared in several noted
Off-Broadway productions, as well as in three
Broadway shows. In 2004, Welch appeared in the films
Marie and Bruce,
The Stepford Wives, and
Keane. In 2005, he again appeared in
Law & Order: Special Victims Unit, and also had roles in the films
The Interpreter and
War of the Worlds. In 2006, he had roles in the television shows,
The Book of Daniel and
The Sopranos, as well as the films
The Hoax and
The Good Shepherd. Welch had roles in the 2008 films
What Just Happened and
Synecdoche, New York. He appeared as David Haig in the television series
Law & Order from 2008 to 2010. In 2009, he appeared in the film
Whatever Works and the television series
Nurse Jackie. In 2010, he appeared as Grant Test in the AMC series
Rubicon. In 2012, he appeared in
The Master, and
Lincoln as
Clerk of the House Edward McPherson, as well as a role in the television series
Elementary. In 2013, he also had a role in the films
Syrup and
Admission, with a role in the television series
Golden Boy. At the time of his death, he was filming his scenes as Peter Gregory in the
HBO series
Silicon Valley, having completed five episodes. When
Silicon Valley won the
Critics' Choice Television Award for Best Comedy Series, creator
Mike Judge dedicated the award to Welch, at the request of Welch's co-star
T.J. Miller. Welch narrated
The Last Apprentice series audiobooks, a young adult fantasy series, for Harper Audio, as well as other audiobooks. Welch sang in a rock band, the Ottoman Bigwigs. ==Death==