William Reibert Mapother Jr.^[1] (/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.

Quick Facts Born, Alma mater ...

William Mapother
Mapother in 2014
Born	William Reibert Mapother Jr. (1965-04-17) April 17, 1965 (age 59) Louisville, Kentucky, U.S.
Alma mater	University of Notre Dame
Occupation	Actor
Years active	1988–present
Relatives	Tom Cruise (cousin)
Website	www.williammapother.com

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Mapother was born in Louisville, Kentucky, the son of Louisa (née Riehm) and William Reibert Mapother Sr.^[2] His father was an attorney and served as a judge in Louisville between 1967 and 1970. Mapother Jr. is a first cousin of actor Tom Cruise, whose full name is Thomas Cruise Mapother IV.

Mapother has become widely known as a character actor, and sometimes plays scary or otherwise dark characters. He played a pivotal role in Todd Field's In the Bedroom, and is perhaps best known as Ethan Rom in the TV show Lost, which he played for 11 episodes during the life of the series.

Mapother has also had considerable roles in a series of independent films, such as The Lather Effect, Moola, Hurt, and Another Earth. Mapother starred in The Burrowers as a Native American fighter who joins a posse to help find missing white settlers.

In September 2007, he was elected to a three-year term on the National Board of Directors for the Screen Actors Guild.

He has provided the motion capture work for Agent 47, the main character in the 2012 video game Hitman: Absolution and also provided the voice before series veteran David Bateson was recast. In 2014, he played the lead in the paranormal horror film The Atticus Institute.^[3]

• List of people from the Louisville metropolitan area