Television – Series Regular
- “How I Met Your Mother” – Barney Stinson (2005-)
- “Stark Raving Mad” – Henry McNeeley (1999-2000)
- “Doogie Howser, M.D.” – Douglas ‘Doogie’ Howser (1989-1993)
Television – Guest Appearances
- “Glee” – Bryan Ryan (2009)
- Dream On - “The Penguins of Madagascar” – Dr Blowhole (2009)
- Dr Blowhole’s Revenge - “Carrie Underwood: An All-Star Holiday Special” – Ace (2009)
- “Batman: The Brave & The Bold” – The Music Meister (2009)
- Mayhem of the Music Meister (voice) - “Family Guy” – Barney (2007 + 2009)
- No Chris Left Behind (voice)
- Peter’s Progress (voice) - “Jack & Bobby” – Prof. Preston Phelps (2005)
- Querida Grace - “Numb3rs” – Ethan Burdick (2005)
- Prime Suspect - “Law & Order: Criminal Intent” – John Tagman (2004)
- Want - “Boomtown” – Peter Corman (2003)
- Monster’s Brawl - “Touched by an Angel” – Jonas (2002)
- The Princeless Bride - “Ed” – Joe Baxter (2001)
- Replacements - “Son of the Beach” – Loverboy (2001)
- Queefer Madness - “Will & Grace” – Bill (2000)
- Girls, Interrupted - “Homicide: Life on the Street” – Alan Schack (1997)
- Valentine’s Day - “The Outer Limits” – Howie Morrison (1996)
- From Within - “Murder, She Wrote” – Tommy Remsen (1993)
- Lone Witness - “Quantum Leap” – Mike Hammond (1993)
- Return of the Evil Leaper – October 8, 1956 - “Roseanne” – Dr. Doogie Howser (1992)
- Less Is More (uncredited) - “Blossom” – The ‘Charming’ Derek Slade (1991)
- Blossom – A Rockumentary - “B.L. Stryker” (1989)
- Blues for Buder


