Liam O'Brien

Acting

May 28, 1976 (50 years old)

Belleville, New Jersey, USA

Popularity: 1

Biography

Liam is an American voice actor, writer and voice director in the Los Angeles area. He has been involved in many English-language adaptations of Japanese anime, and is also a regular in numerous video games and cartoons. [wikipedia]

Also Known As

Liam O'Brian • William Markham • Christopher Liam O'Brien • Liam Christopher O'Brien

Recent & Upcoming

8.0

The Mighty Nein

Executive Producer • Nov 2025

Critical Role Live: Oaths & Ash

Orym, of the Air Ashari • Aug 2025

Critical Role Live: Tag Team at the Teeth – Beyond the Shroud

Orym, of the Air Ashari • Jun 2025

Critical Role Live: Tag Team at the Teeth – The Misty Ascent

Caleb Widogast • Jun 2025

Known For

8.6

Regular Show

Tango (voice)

7.9

Phineas and Ferb

Red Skull (voice)

8.2

The Legend of Vox Machina

Vax'ildan (voice)

7.7

Gem

Star Wars Rebels

Commander (voice)

7.7

Gem

Star Wars Rebels

Lt. Lyste / Stormtrooper Squad Leader (voice)

7.7

Gem

Star Wars Rebels

Lt. Lyste / Morad Sumar (voice)

7.7

Gem

Star Wars Rebels

Deck Officer / Imperial Tech / Lieutenant Lyste (voice)

7.9

Critical Role

Vax'ildan Vessar

7.9

Critical Role

Caleb Widogast

7.9

Critical Role

Orym, of the Air Ashari

7.9

Critical Role

Halandil "Hal" Fang

7.5

Gem

Marvel's Avengers

Red Skull / Commuter (voice)

Filmography

2020s

Critical Role Live: Tag Team at the Teeth – The Misty Ascent

Caleb Widogast

Critical Role Live: Jester and Fjord's Wedding

Caleb Widogast

Critical Role Live: Tag Team at the Teeth – Beyond the Shroud

Orym, of the Air Ashari

Critical Role Live: Oaths & Ash

Orym, of the Air Ashari

6.5

LEGO Marvel Avengers: Code Red

Red Skull / Hydra Goon 2 (voice)

Adventure Never Ends: A Tabletop Saga

Self

6.5

Carmen Sandiego: To Steal or Not to Steal

Professor Maelstrom / Diplomat / Guard 2 (voice)

2010s

6.0

LEGO Marvel Super Heroes: Black Panther - Trouble in Wakanda

Doctor Strange (voice)

6.7

Hulk: Where Monsters Dwell

Doctor Strange (voice)

5.1

The Phoenix Incident

Jacob Reynolds

3.0

Everstar

Paxley (voice)

6.5

Iron Man & Captain America: Heroes United

The Red Skull (voice)

6.6

JLA Adventures: Trapped in Time

Aquaman / Batwing Computer (voice)

7.3

Star Wars Rebels: Spark of Rebellion

Yogar Lyste/ Morad Sumar/ Vendor 1

6.6

Phineas and Ferb: Mission Marvel

Red Skull (voice)

6.0

Iron Man & Hulk: Heroes United

The Red Skull (voice)

7.1

Planet Hulk

Hiroim (voice)

6.7

Wolverine and the X-Men: Fate of the Future

Kurt Wagner / Nightcrawler (voice) (archive footage)

2000s

6.9

Afro Samurai: Resurrection

Shichogoro (voice)

10.0

Adventures in Voice Acting

Self