M
Mark Costello
Biography
Mark began working professionally in Los Angeles back in 1983, when he booked his first job as the "Starter" in, Hot Dog...the Movie". He continued working numerous Co-Star and Guest spots on episodic TV such as, "Murder She Wrote, "Dynasty," Knots Landing," "Who's the Boss," "LA Law," "Full House", "Seventh Heaven," "ER," "N.Y.P.D. Blue," "The West Wing," and "Criminal Minds." Mark also had recurring roles on such television shows as, "Bay City Blues," "JAG", and "First Monday." In 1990, Mark had a three year contract on the FOX youth oriented drama, "Tribes". Mark was very established in the theatre world in Los Angeles, having won Best Actor in a Feature Role from Stage Scene LA, for his performances in,"Finding Fossils" and "John is a Father" at The Road Theatre, as well as "Mom's Dead", at Sacred Fools. Mark appeared with Susan Sullivan and David Selby in Edward Albee's, "A Delicate Balance," at the Odyssey Theatre , which won the LA Drama Critics Circle McCulloh Award for Best Revival. Mark moved to Atlanta in 2017 and has appeared in the films, "Yes, God, Yes," "Our Friend" and the independent feature film, "Charles Sloan", which he played the title role, and which won For Best Full Length Feature Film at the 2022 Raleigh Film and Arts Festival.
Known For

TV
Knots Landing
1979

TV
JAG
Otis Flannik
1995

TV
JAG
Wallace
1995

TV
JAG
Commander Onclay
1995

TV
The West Wing
Guest
1999

TV
ER
Kevin Halloran
1994

TV
Paradise
Billionaire #1
2025

TV
Murder, She Wrote
Guard
1984

TV
Murder, She Wrote
Sgt. O'Connor
1984

TV
Murder, She Wrote
Officer
1984

TV
MacGyver
Cop
1985

TV
Full House
Anchorman
1987

TV
Profiler
Trooper Jasper
1996

TV
Everybody Hates Chris
Mr. Richards
2005

TV
7th Heaven
Ken
1996

Film
Our Friend
Richard
2019

TV
Crazy like a Fox
Nolan
1984

TV
Reasonable Doubts
Hanratty
1991

TV
Femme Fatales
Detective Mitchum
2011

TV
Dead Silent
Will Hilton
2016
Filmography
2025TVParadiseas Billionaire #12023FilmCharles Sloanas Charles Sloan2022FilmAdult Swim Yule Logas Sheriff2020FilmYes, God, Yesas Priest2019FilmOur Friendas Richard2017FilmDoobious Sourcesas Blake Morgan2016TVDead Silentas Will Hilton2011TVFemme Fatalesas Detective Mitchum2010FilmTurbulent Skiesas Gardner2008FilmSolar Flareas Dispatcher Howard2007FilmAn Accidental Christmas2005TVEverybody Hates Chrisas Mr. Richards2005FilmLocustsas Director Rusk1999TVThe West Wingas Guest1996TVProfileras Trooper Jasper1996TV7th Heavenas Ken1996FilmZarkorr! The Invaderas George Ray1995TVJAGas Otis Flannik1994TVERas Kevin Halloran1991TVReasonable Doubtsas Hanratty1990FilmFaithas Policeman1990TVTribesas Carl1987TVFull Houseas Anchorman1987FilmU.S. Marshals: Waco & Rhinehartas FBI Agent #11985TVMacGyveras Cop1984TVCrazy like a Foxas Nolan1984TVMurder, She Wroteas Guard1984FilmHollywood Hot Tubsas Mr. Slate1984FilmHot Dog... The Movieas Event Starter1979TVKnots Landing