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
Magnolia
(1999)
WDKK Show Director's Assistant
Mission: Impossible II
(2000)
Wallis
Blackhat
(2015)
Rich Donahue
Vanilla Sky
(2001)
Clubgoer (uncredited)
The Grudge
(2004)
Matthew Williams
Minority Report
(2002)
Hotel Clerk
Born on the Fourth of July
(1989)
Platoon - Vietnam
Lords of Dogtown
(2005)
Donnie
Swordfish
(2001)
Gabriel's Crew
World Trade Center
(2006)
Marine Sergeant Thomas
Another Earth
(2011)
John Burroughs
I Origins
(2014)
Darryl Mackenzie
Jobs
(2013)
Calligraphy Professor
Without Limits
(1998)
Bob Peters
Ask the Dust
(2006)
Bill
The Atticus Institute
(2015)
Dr. Henry West
Full Filmography
Acting
Born on the Fourth of July
(1989)
Platoon - Vietnam
The Unknown Cyclist
(1998)
By Stander
Without Limits
(1998)
Bob Peters
Magnolia
(1999)
WDKK Show Director's Assistant
Mission: Impossible II
(2000)
Wallis
In the Bedroom
(2001)
Richard Strout
Vanilla Sky
(2001)
Clubgoer (uncredited)
Swordfish
(2001)
Gabriel's Crew
Minority Report
(2002)
Hotel Clerk
The Kiss
(2003)
Peter
Suspect Zero
(2004)
Bill Grieves
The Grudge
(2004)
Matthew Williams
The Zodiac
(2005)
Dale Coverling
Lords of Dogtown
(2005)
Donnie
The Lather Effect
(2006)
Jack
Ask the Dust
(2006)
Bill
World Trade Center
(2006)
Marine Sergeant Thomas
Moving McAllister
(2007)
Bob
Moola
(2007)
Steve
The Burrowers
(2008)
Will Parcher
Lost: Missing Pieces: Jack, Meet Ethan. Ethan? Jack.
(2008)
Ethan Rom
Hurt
(2009)
Darryl Coltrane
Edwin Boyd: Citizen Gangster
(2011)
Detective Rhys
Portraits in Dramatic Time
(2011)
Another Earth
(2011)
John Burroughs
A Warrior's Heart
(2011)
Coach David Milligan
Darnell Dawkins: Mouth Guitar Legend
(2012)
Pastor Jenkins
Static
(2012)
Greg Wagner
FDR: American Badass!
(2012)
Dr. Ellington
Escape from Polygamy
(2013)
Ervil
Underdogs
(2013)
Bill Burkett
It's Dark Here
(2013)
David Tennies
Jobs
(2013)
Calligraphy Professor
I Origins
(2014)
Darryl Mackenzie
Drew Peterson: Untouchable
(2014)
Glenn Levecke
The Atticus Institute
(2015)
Dr. Henry West
Blackhat
(2015)
Rich Donahue
Tell Me How I Die
(2016)
Dr. Jerrems
Son of Monarchs
(2021)
Bob
On Sacred Ground
(2023)
Daniel McKinney
Outlaw Posse
(2024)
Angel
Production
Writing