Greg Medavoy for all 12 seasons of the television series NYPD Blue, winning an Emmy Award in 1998.
His film credits include Return of the Secaucus 7 (1979), Running (1979), Matewan (1987), Eight Men Out (1988, as Chicago White Sox catcher Ray Schalk), Termini Station (1989), The Rage: Carrie 2 (1999), Rules of Engagement (2000), Sunshine State (2002), and Flags of Our Fathers (2006) as United States Marine Corps Gen. Holland Smith.
Later that year, Clapp also appeared as Det Dick Walenski in "In Name and Blood," season 3 episode 2 of Criminal Minds.
[4] In 2014, Clapp began playing a recurring role as Chaplain Orlovsky in Chicago Fire.
[5] In 2021 Clapp had a modest but critical role in the acclaimed HBO series Mare of Easttown, playing key witness Pat Ross.