Liam O'Brien
Biography
Liam O'Brien is an American voice actor, writer, and voice director based in the Los Angeles area. He was born on May 28, 1976, in Belleville, New Jersey, United States. His professional work includes involvement in numerous English-language adaptations of Japanese anime, alongside regular appearances in various video games and cartoons. Documented profile records list fifty-eight known acting credits. Alternative names associated with him in reference materials include Liam O'Brian, William Markham, and Christopher.
Career overview
Liam O'Brien is an American voice actor, writer, and voice director based in the Los Angeles area. His professional work includes involvement in numerous English-language adaptations of Japanese anime. In addition to his anime work, he is a regular participant in various video games and cartoons.
Public biographical data records his professional background spanning television and film mediums, with known credits totaling fifty-eight entries within database records. His professional repertoire encompasses acting across these multiple entertainment sectors.
Born on May 28, 1976, in Belleville, New Jersey, United States, his alternative names are listed in professional records as Liam O'Brian, William Markham, and Christopher.
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Frequent co-stars
Career timeline
Full Filmography
83 titles- Tale Gate (2026) as Self
- The Mighty Nein (2025) as Caleb (voice)
- The Mighty Nein (2025) Executive Producer
- LEGO Marvel Avengers: Strange Tails (2025) as Doctor Strange / Red Skull (voice)
- Critical Role Live: Oaths & Ash (2025) as Orym, of the Air Ashari
- Age of Umbra (2025) as Skreev
- Weird Kids (2025) as McTuff (voice)
- Critical Role Live: Jester and Fjord's Wedding (2025) as Caleb Widogast
- Critical Role Live: Tag Team at the Teeth – The Misty Ascent (2025) as Caleb Widogast
- Critical Role Live: Tag Team at the Teeth – Beyond the Shroud (2025) as Orym, of the Air Ashari
- Critical Role Abridged (2024) as Orym, of the Air Ashari
- Critical Role Cooldown (2024) as Self
- Critical Role Cooldown (2024) Creator
- Fireside Chat (2024) as Self
- Daggerheart (2024) as Xarlo Grandall
- MOONWARD (2024) as Walden Orlock
- Star Wars: Young Jedi Adventures (2023) as Master Estala Maru (voice)
- Star Wars: Young Jedi Adventures (2023) as Onderrs (voice)
- Candela Obscura (2023) as Cosmo Grimm
- Candela Obscura (2023) as Game Master
- LEGO Marvel Avengers: Code Red (2023) as Red Skull / Hydra Goon 2 (voice)
- Adventure Never Ends: A Tabletop Saga (2023) as Self
- The Legend of Vox Machina (2022) as Vax'ildan (voice)
- The Legend of Vox Machina (2022) Executive Producer
- The Legend of Vox Machina (2022) Writer
- Dirty Laundry (2022) as Self - Guest
- 4-Sided Dive (2022) as Self
- Star Wars: The Bad Batch (2021) as Bolo / Tactical Droid (voice)
- Star Wars: The Bad Batch (2021) as Bolo / Captured Falleen / Raney (voice)
- Star Wars: The Bad Batch (2021) as Bolo / Scrapper (voice)
- Star Wars: The Bad Batch (2021) as Bolo (voice)
- Star Wars: The Bad Batch (2021) as Bolo / Pyke (voice)
- Star Wars: The Bad Batch (2021) as Bartender Droid / Stormtrooper #1 / Stormtrooper #3 (voice)
- Star Wars: The Bad Batch (2021) as Devaronian Captain / Pyke (voice)
- DOTA: Dragon's Blood (2021) as Nikdo / Bandit #1 / Bandit #4 (voice)
- Exandria Unlimited (2021) as Orym, of the Air Ashari
- Exandria Unlimited (2021) as Erro Mordaurum
- Narrative Telephone (2020) as Self
- Narrative Telephone (2020) as Self - Storyteller
- Crit Recap Animated (2020) as Caleb Widowgast (voice)
- Crit Recap Animated (2020) as Orym, of the Air Ashari (voice)
- Carmen Sandiego: To Steal or Not to Steal (2020) as Professor Maelstrom / Diplomat / Guard 2 (voice)
- Carmen Sandiego (2019) as Professor Maelstrom / Vlad / Boris / Others (voice)
- Critical Role: The Mighty Nein (2018) as Caleb Widogast
- Critical Role: The Mighty Nein (2018) Creator
- Um, Actually... (2018) as Self - Contestant
- Between the Sheets (2018) as Self
- LEGO Marvel Super Heroes: Black Panther - Trouble in Wakanda (2018) as Doctor Strange (voice)
- Sagas of Sundry (2017) as Emmett Markham
- Hulk: Where Monsters Dwell (2016) as Doctor Strange (voice)
- Ginger & Snapper (2016) as Snapper (voice)
- Critical Role (2015) as Orym, of the Air Ashari
- Critical Role (2015) as Vax'ildan Vessar
- Critical Role (2015) as Caleb Widogast
- Critical Role (2015) as Halandil "Hal" Fang
- Critical Role (2015) Creator
- CelebriD&D (2015) as Vax'ildan
- The Phoenix Incident (2015) as Jacob Reynolds
- Everstar (2015) as Paxley (voice)
- Star Wars Rebels (2014) as Commander (voice)
- Star Wars Rebels (2014) as Lt. Lyste / Stormtrooper Squad Leader (voice)
- Star Wars Rebels (2014) as Lt. Lyste / Morad Sumar (voice)
- Star Wars Rebels (2014) as Deck Officer / Imperial Tech / Lieutenant Lyste (voice)
- Iron Man & Captain America: Heroes United (2014) as The Red Skull (voice)
- JLA Adventures: Trapped in Time (2014) as Aquaman / Batwing Computer (voice)
- Star Wars Rebels: Spark of Rebellion (2014) as Yogar Lyste/ Morad Sumar/ Vendor 1
- Marvel's Avengers (2013) as Doctor Strange (voice)
- Marvel's Avengers (2013) as Red Skull / Commuter (voice)
- Marvel's Avengers (2013) as Red Skull (voice)
- Sofia the First (2013) as Boswell (voice)
- Iron Man & Hulk: Heroes United (2013) as The Red Skull (voice)
- Phineas and Ferb: Mission Marvel (2013) as Red Skull (voice)
- Game On! (2012) as Self - Guest
- Regular Show (2010) as Tango (voice)
- G.I. Joe: Renegades (2010) as Captain Anatoly Krimov/Red Star/German CEO (voice)
- Planet Hulk (2010) as Hiroim (voice)
- Wolverine and the X-Men: Fate of the Future (2010) as Kurt Wagner / Nightcrawler (voice) (archive footage)
- Wolverine and the X-Men (2009) as Kurt Wagner (voice)
- Afro Samurai: Resurrection (2009) as Shichogoro (voice)
- Adventures in Voice Acting (2008) as Self
- Phineas and Ferb (2007) as Red Skull (voice)
- Descendants of Darkness (2000) as (voice)
- The Dragon King
Frequently Asked Questions
What movies or TV shows is Liam O'Brien best known for?
Liam O'Brien is widely recognized for notable roles and projects including The Mighty Nein (2025), The Mighty Nein (2025), Weird Kids (2025), Critical Role Cooldown (2024).
When and where was Liam O'Brien born?
Liam O'Brien was born on May 28, 1976 in Belleville, New Jersey, USA.
How many credits does Liam O'Brien have?
Liam O'Brien has accumulated over 83 film and television credits across a career spanning from 2000 to 2026.
What is Liam O'Brien's background in cinema and television?
Liam O'Brien is an American voice actor, writer, and voice director based in the Los Angeles area. He was born on May 28, 1976, in Belleville, New Jersey, United States. His professional work includes involvement in numerous English-language adaptations of Japanese anime, alongside regular appearances in various video ...