My Take
William Mapother is one of those actors who makes you feel genuinely uneasy in the best possible way — the man was born to play characters who are wrong in ways you can't quite put your finger on. His turn as Ethan Rom on Lost is legitimately one of the creepiest recurring performances in prestige TV history; he barely said a word and still managed to make every scene feel like a threat. But he's more than a villain-for-hire: In the Bedroom showed real dramatic depth, and Another Earth leaned into a quieter, more haunted register that he nailed completely. A Notre Dame-educated guy from Louisville who never became a household name despite having genuine chops — I think he's exactly the kind of actor serious film people appreciate far more than casual audiences do, and honestly that feels right for him.
Overview
William Reibert Mapother Jr. (; 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.
1. Profile
- Name (English)
- William Mapother
- Name (Japanese)
- ウィリアム・メイポーザー
- Reading
- うぃりあむ・めいぽーざー
- Born
- April 17, 1965 (age 61)
- Zodiac / Chinese zodiac
- Aries / Snake
- Origin
- Louisville, Kentucky, United States
- Blood type
- Private
- Height
- Private
- Agency
- Private
- Occupation
- actor / teacher / film actor / television actor
2. Background
- Elementary school
- Private
- Junior high
- Private
- High school
- St. Xavier High School
- University
- University of Notre Dame
3. Relationships
- Spouse
- Private
- Children
- Private
- Parents
- Private
- Siblings
- Private
4. Personality
Motto
Private
6. Links
7. About this entry
Tags
- Last updated
- 2026-06-02
Facts are limited to publicly available information up to 2024; non-public items are marked "Private / Unknown". English text is machine-assisted (facts translated by Sonnet, "My Take" written by Opus 4.8). The Japanese page is the source of record.