- Co-authored the "Star Trek: The Next Generation" novel "I, Q" with Peter David
- Narrated a documentary entitled "Deadly Bugs" for Discovery Channel
- Together with Leonard Nimoy (Mr. Spock), he founded the audio-book-series "Alien Voices".
- Early 1990s: Wrote an issue of the Star Trek: The Next Generation comic book for DC Comics.
- 1999: Co-starred with Leonard Nimoy in the Alien Voices audio play "Star Trek: Spock Vs. Q".
- Star Trek: Spock vs. Q (Alien Voices production) (1999) as Q - CD-Audio / Live performance
- Star Trek: Spock vs. Q - The Sequel (Alien Voices production) (2000) as Q (referred to as Spock vs. Q - Armageddon Tonight on CD) - CD-Audio / Live performance
- (April 2005) Played Jeffrey in "A Naked Girl on Appian Way" play by Richard Greenberg (Segerstrom Stage, South Coast Repertory, Costa Mesa, California, USA).
- TV commercials for Compaq computers
- (2000, October - November) Starred as Marc in the Yasmina Reza play "Art" at the South Coast Repertory, Costa Mesa, California, USA.
- TV commercial, promoting "Star Trek: The Next Generation" for K.O.K.I.-TV Fox 23 in Tulsa, Oklahoma (1987).
- (1987) TV Commercial: Vick's Formula 44 cough suppressant
- (2011) Audio Drama: "Macabre Mansion Presents... A Christmas Carol" - Narrator
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