John O'Brien
- Acting
Known for
Filmography
- Good Grief · Dan
- Cheaper by the Dozen · Principal
- This Game's Called Murder · Man in Suit
- Hacks · Duncan
- Perry Mason · Ernie Magnuson
- Bob Hearts Abishola · James
- Dirty John · Cameron Scott
- Light as a Feather · Reverend Fahey
- 9-1-1 · Rod Billings
- S.W.A.T. · Weber
- The Last Heist · Manager Mark
- Superstore · Mike
- Mortdecai · Butler
- Transparent · Professor
- Young & Hungry · Mr. Klepfer
- The Crazy Ones · Larry
- Mom · Waiter
- The Mindy Project · Dr. Jones
- Don't Trust the B---- in Apartment 23 · Tom
- Being Flynn · Airline Pilot
- Austin & Ally · Mr. Neidermeyer
- Workaholics · Doctor
- Shameless · Father Monroe
- Law & Order: LA · Scott Hancox
- Better With You · Florist
- Pretty Little Liars · Principal Hackett
- Victorious · Mr. Mooney
- Community · Chaplin
- Eleventh Hour · Manager
- The Middleman · Newscaster
- Chuck · Older CIA Tech
- Mad Men · Phil Kennedy
- Flicka · Mr. Masterson
- Ugly Betty · Joe of Happy Homes
- Criminal Minds · Dr. Meyer
- Grey's Anatomy · Lab Tech Jeffrey
- Medium · Hotel Clerk
- Desperate Housewives · Dr. Wheeler
- Boston Legal · Clerk #2
- NCIS · Bruce
- Two and a Half Men · Waiter
- Less than Perfect · Executive
- What I Like About You · Dr. Thompson, Minister
- Monk · Maitre'd
- Enough · Front Desk Clerk
- Scrubs · Man
- Malcolm in the Middle · Sales Clerk
- BeastMaster · Village leader
- The West Wing · Reporter
- Will & Grace · Salesperson, Man
- Mom, Can I Keep Her? · Nigel
- Ally McBeal · Waiter
- The Practice · Foreman
- Isle of Lesbos · Farmer
- Clueless · Zombie
- The Drew Carey Show · Rick
- Friends · Airline Employee
- The X-Files · Missionary #2