Mark Costello
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









Credits
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Paradise 2025Billionaire #1★ 7.6
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Charles Sloan 2023Charles Sloan★ NR
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Adult Swim Yule Log 2022Sheriff★ 6.3
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Yes, God, Yes 2020Priest★ 6.3
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Our Friend 2019Richard★ 7.2
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Doobious Sources 2017Blake Morgan★ 3.5
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Dead Silent 2016Will Hilton★ 6.8
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Femme Fatales 2011Detective Mitchum★ 6.4
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Turbulent Skies 2010Gardner★ 5.4
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Solar Flare 2008Dispatcher Howard★ 3.7
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★ 5.6
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Locusts 2005Director Rusk★ 3.6
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The West Wing 1999Guest★ 8.3
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7th Heaven 1996Ken★ 6.4
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Zarkorr! The Invader 1996George Ray★ 4.5
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JAG 1995Otis Flannik★ 7.3
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ER 1994Kevin Halloran★ 7.8
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Reasonable Doubts 1991Hanratty★ 7.2
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Faith 1990Policeman★ 2
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Tribes 1990Carl★ 5
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Full House 1987Anchorman★ 7.5
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FBI Agent #1★ NR
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MacGyver 1985Cop★ 7.7
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Crazy like a Fox 1984Nolan★ 7.1
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Murder, She Wrote 1984Guard★ 7.5
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Hollywood Hot Tubs 1984Mr. Slate★ 3.5
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Hot Dog... The Movie 1984Event Starter★ 4.8
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Knots Landing 1979★ 6.7