Root began his career on stage in 1980. He made his Broadway acting debut in the play ''
Journey's End, playing Second Lieutenant Trotter. He also appeared in All My Sons as Frank Lubey, and as Jon in the 2015 play Marjorie Prime''. Root made his feature film debut in the 1988 film
Crocodile Dundee II as a
DEA agent. That same year, he acted in the
psychological horror film
Monkey Shines as Dean Burbage. He has a small role as a detective in the movie
Ghost (1990), as well as roles in
Dave (1993) and
RoboCop 3 (1993). Root has also had many guest appearances in television programs across several genres. He was
Klingon Captain K'Vada in the
Star Trek: The Next Generation two-part episode "
Unification" in 1991. He portrayed the role of an exterminator in the
Home Improvement 1991 episode "Wild Kingdom." He played Raymond, a hunting store owner involved in illegal gun trading, in the 1993
In the Heat of the Night episode "A Love Lost." He guest-starred on
Seinfeld as a bank manager in the 1996 episode "
The Invitations", handling
Kramer's hello greeting issue. In the
CSI episode "Homebodies" from 2003, he played the father of a rape victim. He had a role in
Frasier in the 2004 episode "
Detour" as the father of the family helping Frasier when his car broke down. In the 1993–1994 television season, Root appeared as a series regular as "R.O." on the
Beau Bridges/
Lloyd Bridges comedy/
western series
Harts of the West on
CBS. He also had a regular role on the short-lived CBS series
Ladies Man (1999-2000), which starred
Sharon Lawrence soon after she left
NYPD Blue. Among his most recognized television roles are eccentric billionaire Jimmy James on the sitcom
NewsRadio (1995–1999), and in a recurring role on the final two seasons of
The West Wing (2005–2007) as
Republican campaign consultant Bob Mayer. He appeared in many comedy films, particularly as the mumbling, quirky Milton Waddams in
Mike Judge's
Office Space (1999); and four nominations for the
Screen Actors Guild Award for Outstanding Performance by an Ensemble in a Comedy Series. In 2020, he appeared as Maynard Barnes in the HBO series
Perry Mason, and from 2021-2023, he played Ron Petkus in HBO's
Succession. ==Personal life==