CommonKnowledge
daily insights | January 15, 2026

William Mapother Net Worth



William Reibert Mapother, Jr. net worth is
$18 Million

William Reibert Mapother, Jr. Wiki: Salary, Married, Wedding, Spouse, Family

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. 
Full NameWilliam Reibert Mapother, Jr.
Net Worth$18 Million
Date Of Birth1965-04-17
Place Of BirthLouisville, Kentucky, U.S.
OccupationActor
ProfessionAmerican actor
NicknamesWilliam Mapother, Mapother, William
#Quote
1I never really worried about it. As I've amassed a body of work, the questions about Tom have gone away. I figured that if I did good work, I'd be seen for what I am. - talking about his famous cousin, Tom Cruise.
#Fact
1Along with Daniel London, he is one of only two actors to appear in both Minority Report (2002) and its television adaptation Minority Report (2015). He played a hotel clerk in the former and Charlie Peele in the latter.
2Co-founder of Slated, the online marketplace for film finance.
3Co-founded the Flyover Film Festival in Louisville, KY.
4Elected to National Board of the Screen Actors Guild. [September 2007]
5Graduate of the Joanne Baron / D.W. Brown Acting School in Santa Monica, California.
6Last name is pronounced "MAY-pah-ther"
7Older brother of Amy Mapother and Katherine Mapother.
8His father, William Reibert, Sr., was an attorney and bankruptcy consultant and was a judge in Louisville, Kentucky (1967 - 1970). His mother's name is Louisa.
9Went to St. Xavier High School in Louisville Kentucky.
10Was a school teacher in East Los Angeles for 3 years before becoming an actor.
11Graduated from Notre Dame with a B.A. in English.
12Younger cousin of Tom Cruise and Lee Anne De Vette.

All pictures

Actor

TitleYearStatusCharacter
Constantine2015TV SeriesJacob Shaw
The Atticus Institute2015Dr. Henry West
Blackhat2015Rich Donahue
Catch2014/IIShortFrank
Hawaii Five-02014TV SeriesEric Porter
The Lottery2014TV SeriesTyler Waters
The Mentalist2011-2014TV SeriesRichard Haibach
I Origins2014Darryl Mackenzie
It's Dark Here2013David Tennies
Lightning Returns: Final Fantasy XIII2013Video GameAdditional Voices (voice)
Castle2013TV SeriesCarl Matthews
Escape from Polygamy2013TV MovieErvil
Mad Men2013TV SeriesRandall Walsh
Underdogs2013Bill Burkett
Jobs2013Calligraphy Professor
Ro2012TV SeriesRavi
American Horror Story2012TV SeriesDriver
Hitman: Absolution2012Video GameHitman: Agent 47 (mocap)
Static2012/IGreg Wagner
Dr0ne2012TV SeriesThe Supervisor (2012)
Burn Notice2012TV SeriesGarret Hartley
The Secret World2012Video GamePaul Gamelin (voice)
Incident on Marmont Avenue2012ShortAlbert
FDR: American Badass!2012Dr. Ellington
Justified2012TV SeriesDelroy Baker
Drew Peterson: Untouchable2012TV MovieGlenn Levecke
Citizen Gangster2011Detective David Rhys
Portraits in Dramatic Time2011William Mapother
A Warrior's Heart2011Coach David Milligan
Another Earth2011John Burroughs
Darnell Dawkins: Mouth Guitar Legend2010Pastor Jenkins
Fallout: New Vegas2010Video GameColonel Hsu (voice)
Halo: Reach2010Video GameAir Control / Dispatch (voice)
I <3 Vampires2010TV SeriesWilliam
Law & Order: Criminal Intent2010TV SeriesJohn Silvestri
Lost2004-2010TV SeriesEthan Rom
The Young and the Restless2010TV SeriesGavin
Human Target2010TV SeriesSam Fisher
Hurt2009Darryl Coltrane
WordGirl2009TV SeriesGuy Rich
Prison Break2009TV SeriesFBI Agent Chris Franco
Criminal Minds2008TV SeriesIan Corbin
The Burrowers2008William Parcher
Lost: Missing Pieces2008TV Mini-SeriesEthan Rom
Skip Tracer2008TV MovieHenry Hargrove Jr.
Viva Laughlin2007TV SeriesSweet Lenny Collins
K-Ville2007TV SeriesGordon Wix
Moving McAllister2007Bob
Moola2007Steve
Robot Chicken2006TV SeriesLeprechaun #2 / Alien Bully / Billy
World Trade Center2006Marine Sergeant Thomas
The Lather Effect2006Jack
The Inside2006TV SeriesRonald Ewing
Crossing Jordan2005TV SeriesHenry Bishop
Threshold2005TV SeriesGunneson
Chloe2005ShortDoctor
The Zodiac2005Dale Coverling
Lords of Dogtown2005Donnie
The Grudge2004Matthew
NCIS2004TV SeriesKyle Grayson
CSI: Miami2004TV SeriesPete Keller
Suspect Zero2004Bill Grieves
Line of Fire2004TV SeriesLarry
The Kiss2003VideoPeter
Touched by an Angel2003TV SeriesEddie
Law & Order: Special Victims Unit2003TV SeriesLuke Edmunds
The Pennsylvania Miners' Story2002TV MovieJohn 'Flathead' Phillippi
CSI: Crime Scene Investigation2002TV SeriesDouglas Sampson
Self Storage2002ShortGraham
Minority Report2002Hotel Clerk
Vanilla Sky2001Clubgoer (uncredited)
Swordfish2001Gabriel's Crew
In the Bedroom2001Richard Strout
Almost Famous2000Bartender (scenes deleted)
Mission: Impossible II2000Wallis
Magnolia1999WDKK Show Director's Assistant
The Unknown Cyclist1998By-Stander
Trickle1998ShortJosh Riddell
Without Limits1998Bob Peters
Born on the Fourth of July1989Platoon - Vietnam (as William R. Mapother)
The Inheritance2013/IIShort completedVillem

Miscellaneous

TitleYearStatusCharacter
The Watch2015TV Series narrator - 4 episodes
The Lachrymist2014Short script consultant
Hitman: Absolution2012Video Game motion capture actor: Agent 47
Mission: Impossible II2000special consultant
Born on the Fourth of July1989assistant: Tom Cruise
Rain Man1988production assistant
Cocktail1988production assistant

Soundtrack

TitleYearStatusCharacter
In the Bedroom2001performer: "Happy Birthday to You" 1893 - uncredited

Thanks

TitleYearStatusCharacter
The New Sudan2010Documentary very special thanks
Meeting Resistance2007Documentary special thanks
Mean Creek2004thanks

Self

TitleYearStatusCharacter
The Playboy Morning Show2015TV SeriesHimself
American War Generals2014TV Movie documentaryNarrator
Celebrity Ghost Stories2012TV Series documentaryHimself
Made in Hollywood2011TV SeriesHimself
Life After LOST: Ethan Adopts2010ShortHimself
The New Sudan2010DocumentaryNarrator
Stars of the 2008 Vail Film Festival2008Video shortHimself
Up Close with Carrie Keagan2008TV SeriesHimself
Mountaintop Removal2007DocumentaryNarrator
A Powerful Rage: Behind 'The Grudge'2005Video documentaryHimself
The 72nd Annual Academy Awards2000TV SpecialHimself - Audience Member

Archive Footage

Nominated Awards

YearAwardCeremonyNominationMovie
2002ActorScreen Actors Guild AwardsOutstanding Performance by the Cast of a Theatrical Motion PictureIn the Bedroom (2001)
2001ACCAAwards Circuit Community AwardsBest Cast EnsembleIn the Bedroom (2001)

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