John O'Brien
Actor
Active 1993–present
Filmography
Friends (1994) — Airline EmployeeGrey's Anatomy (2005) — Lab Tech JeffreyMalcolm in the Middle (2000) — Sales ClerkCriminal Minds (2005) — Dr. MeyerThe X-Files (1993) — Missionary #2Shameless (2011) — Father Monroe9-1-1 (2018) — Rod BillingsPretty Little Liars (2010) — Principal HackettTwo and a Half Men (2003) — WaiterVictorious (2010) — Mr. MooneyCommunity (2009) — ChaplinDesperate Housewives (2004) — Dr. WheelerMad Men (2007) — Phil KennedyNCIS (2003) — BruceS.W.A.T. (2017) — WeberMonk (2002) — Maitre'dChuck (2007) — Older CIA TechThe West Wing (1999) — ReporterSuperstore (2015) — MikeMedium (2005) — Hotel ClerkEnough (2002) — Front Desk ClerkMom (2013) — WaiterBoston Legal (2004) — Clerk #2Hacks (2021) — Duncan