(written from a Production point of view)
His first role in Star Trek was as the holographic Nazi SS captain in VOY: "The Killing Game" and "The Killing Game, Part II". He later returned to Voyager to play One, a 29th century Borg drone in the episode "Drone".
He provided his voice for several Star Trek computer games as well. He played Melkor, the primary antagonist in Star Trek: Klingon Academy, and later voiced several characters in Star Trek: Bridge Commander, including Gul Sek, Commander Joshua Martin, and Ambassador Saalek.
He has since had guest spots on TV shows such as Nip/Tuck and Numb3rs.