Liam O'Brien is an American voice actor, writer, and director, known for his work in animation, video games, and dubbing. He has voiced characters in popular series such as Naruto and The Legend of Korra, showcasing his versatility in bringing various personalities to life. In addition to his voice acting, O'Brien is a co-founder of the web series Critical Role, where he and other voice actors play tabletop role-playing games. This series has gained a large following and has contributed to the popularity of role-playing games in mainstream culture.