William Mapother

Acting·April 17, 1965 — 61 years old·Louisville, Kentucky, USA

William Reibert Mapother Jr. (/ˈmeɪpɒθər/; born April 17, 1965) is an American actor, known for his role as Ethan Rom on the television series Lost and starring in the film In the Bedroom. He is also known for the film Another Earth.

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Known For

Minority Report

2002·7.4

Mission: Impossible II

2000·6.1

American Horror Story

Lost

Vanilla Sky

Supergirl

The Mentalist

Law & Order: Special Victims Unit

Criminal Minds

Magnolia

The Blacklist

Grimm

Filmography · 80

—The Possession at Gladstone ManorHenry Gladstone —ShedDr. Levin 2026The LeaderReverend Applewhite 2025Suits LATVGreg Fisher 2024Outlaw PosseAngel 2023Black Girl MissingRussell 2023On Sacred GroundDaniel McKinney · Writer 2021Son of MonarchsBob · Co-Executive Producer 2021A Little DreamTVWayne 20209-1-1: Lone StarTVBruce Ackerman 2020FBI: Most WantedTVTravis Russell 2016MacGyverTVThe Client / Daniel Holt 2016Tell Me How I DieDr. Jerrems 2016Rush HourTVPrincipal 2015SupergirlTVDr. Rudy Jones / Parasite 2015Minority ReportTVCharlie Peele 2015PowersTVTodd Secor 2015BlackhatRich Donahue 2015The Atticus InstituteDr. Henry West 2014ConstantineTVJacob Shaw 2014American War GeneralsSelf - Narrator 2014I OriginsDarryl Mackenzie 2014Drew Peterson: UntouchableGlenn Levecke 2013The BlacklistTVBill 2013Escape from PolygamyErvil 2013UnderdogsBill Burkett 2013JobsCalligraphy Professor 2013It's Dark HereDavid Tennies 2012StaticGreg Wagner 2012FDR: American Badass!Dr. Ellington 2012Darnell Dawkins: Mouth Guitar LegendPastor Jenkins 2011A Warrior's HeartCoach David Milligan 2011GrimmTVDwight Eleazer 2011American Horror StoryTVDriver 2011Edwin Boyd: Citizen GangsterDetective Rhys 2011Another EarthJohn Burroughs 2011Portraits in Dramatic Time 2010Hawaii Five-0TVEric Porter 2010JustifiedTVDelroy Baker 2010Human TargetTVSam Fisher 2009HurtDarryl Coltrane 2009Celebrity Ghost StoriesTVSelf 2009CastleTVCarl Matthews 2008The MentalistTVRichard Haibach 2008The BurrowersWill Parcher 2007Viva LaughlinTV 2007K-VilleTV 2007Moving McAllisterBob 2007Mad MenTVRandall Walsh 2007Burn NoticeTVGarret Hartley 2007MoolaSteve 2006World Trade CenterMarine Sergeant Thomas 2006The Lather EffectJack 2006Ask the DustBill 2005Criminal MindsTVIan Corbin 2005ThresholdTV 2005The ZodiacDale Coverling 2005The InsideTVRonald Ewing 2005Lords of DogtownDonnie 2004The GrudgeMatthew Williams 2004LostTVEthan Rom 2004Suspect ZeroBill Grieves 2003NCISTVKyle Grayson 2003The KissPeter 2002CSI: MiamiTVPete Keller 2002Minority ReportHotel Clerk 2002The Pennsylvania Miners' StoryJohn 'Flathead' Phillippi 2001Vanilla SkyClubgoer (uncredited)2001In the BedroomRichard Strout 2001Law & Order: Criminal IntentTVJohn Silvestri 2001Crossing JordanTVHenry Bishop 2001SwordfishGabriel's Crew 2000CSI: Crime Scene InvestigationTVDouglas Sampson 2000Mission: Impossible IIWallis 1999MagnoliaWDKK Show Director's Assistant 1999Law & Order: Special Victims UnitTVLuke Edmunds 1998The Unknown CyclistBy Stander 1998Without LimitsBob Peters 1994Touched by an AngelTVEddie 1989Born on the Fourth of JulyPlatoon - Vietnam