John Kassir is an American actor and voice actor. He was married to fellow actress Julie Benz, the voice of Commander Miranda Keyes, in 1998. He was born on 24 October 1957 in Baltimore, Maryland, USA. He has numerous credits to his name, including Avatar: The Last Airbender and CSI: Miami. He is an actor of all types, working on movies, television shows, animated series', and video games. He also works as a producer, director, and soundtrack artist.

He was probably brought in by his wife to help in the production of Halo 2. He was one of the extra voice talents, voicing a few of the Marines throughout the game.