Cast & creator
William Mapother
Best known for Law & Order: Special Victims Unit, The Mentalist, CSI: Crime Scene Investigation
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. Description above from the Wikipedia article William Mapother, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Also known as: William Reibert Mapother Jr., William R. Mapother, Уильям Мапотер, ویلیام مپوتر
48
film credits
34
television credits
80
1989–2026 · acting roles
6.5
average across scored titles
Signature credits
Known for
Across film & television
Filmography (82)
Showing 82 of 82 credits
Law & Order: Special Victims Unit
Luke Edmunds
1999
The Mentalist
Richard Haibach
2008
CSI: Crime Scene Investigation
Douglas Sampson
2000
Criminal Minds
Ian Corbin
2005
NCIS
Kyle Grayson
2003
American Horror Story
Driver
2011
The Blacklist
Bill
2013
Castle
Carl Matthews
2009
Hawaii Five-0
Eric Porter
2010
Law & Order: Criminal Intent
John Silvestri
2001
CSI: Miami
Pete Keller
2002
Lost
Ethan Rom
2004
Grimm
Dwight Eleazer
2011
Mad Men
Randall Walsh
2007
FBI: Most Wanted
Travis Russell
2020
Crossing Jordan
Henry Bishop
2001
Touched by an Angel
Eddie
1994
Supergirl
Dr. Rudy Jones / Parasite
2015
9-1-1: Lone Star
Bruce Ackerman
2020
MacGyver
The Client / Daniel Holt
2016
Justified
Delroy Baker
2010
Burn Notice
Garret Hartley
2007
Powers
Todd Secor
2015
Celebrity Ghost Stories
Self
2009
Human Target
Sam Fisher
2010
Minority Report
Hotel Clerk
2002
Mission: Impossible II
Wallis
2000
Constantine
Jacob Shaw
2014
Rush Hour
Principal
2016
Suits LA
Greg Fisher
2025
Threshold
2005
Vanilla Sky
Clubgoer (uncredited)
2001
Swordfish
Gabriel's Crew
2001
Minority Report
Charlie Peele
2015
Magnolia
WDKK Show Director's Assistant
1999
The Inside
Ronald Ewing
2005
Blackhat
Rich Donahue
2015
Born on the Fourth of July
Platoon - Vietnam
1989
The Grudge
Matthew Williams
2004
I Origins
Darryl Mackenzie
2014
World Trade Center
Marine Sergeant Thomas
2006
Another Earth
John Burroughs
2011
Lords of Dogtown
Donnie
2005
K-Ville
2007
Viva Laughlin
2007
Jobs
Calligraphy Professor
2013
In the Bedroom
Richard Strout
2001
Suspect Zero
Bill Grieves
2004
Edwin Boyd: Citizen Gangster
Detective Rhys
2011
Tell Me How I Die
Dr. Jerrems
2016
The Atticus Institute
Dr. Henry West
2015
Ask the Dust
Bill
2006
Without Limits
Bob Peters
1998
A Warrior's Heart
Coach David Milligan
2011
SHED
Dr. Levin
2026
It's Dark Here
David Tennies
2013
The Leader
Reverend Applewhite
2026
Darnell Dawkins: Mouth Guitar Legend
Pastor Jenkins
2012
Outlaw Posse
Angel
2024
The Burrowers
Will Parcher
2008
A Little Dream
Wayne
2021
The Zodiac
Dale Coverling
2005
The Pennsylvania Miners' Story
John 'Flathead' Phillippi
2002
The Unknown Cyclist
By Stander
1998
Moving McAllister
Bob
2007
Drew Peterson: Untouchable
Glenn Levecke
2014
Portraits in Dramatic Time
2011
The Lather Effect
Jack
2006
Static
Greg Wagner
2012
Underdogs
Bill Burkett
2013
Black Girl Missing
Russell
2023
Hurt
Darryl Coltrane
2009
Escape from Polygamy
Ervil
2013
Son of Monarchs
Bob
2021Son of Monarchs
Co-Executive Producer
2021
Moola
Steve
2007The Possession at Gladstone Manor
Henry Gladstone
FDR: American Badass!
Dr. Ellington
2012
On Sacred Ground
Daniel McKinney
2023On Sacred Ground
Writer
2023
The Kiss
Peter
2003
American War Generals
Self - Narrator
2014