- Has served as the opening act for performers such as Rodney Dangerfield, George Carlin, The Temptations, and The Four Tops.
- Promos for Pinky and the Brain (1995) on Nickelodeon (as The Brain) (voice) (August 2000)
- TV commercials for Kellogg's Froot Loops (as Toucan Sam) (voice)
- Voices various characters for a series of Shockwave internet shorts based on _"Critic, The" (1994)_.
- Occasional Sketch Player and Writer on "An Evening At The Improv" (1981)
- (1986) Was the wildly rapid-fire impressionist/spokesman in a series of Clio Award winning commercials for Fuji Videotape (on-camera)
- Voice of the Gateway Cow. TV commercial for Gateway Computers (2001)
- TV commercial for Honda (2001)
- Voice of Oscar Wildcat in sho.com's "Queer Duck" Flash animation series
- When DeForest Kelley died before completing his lines for the unfinished "Secret of Vulcan Fury" PC game, LaMarche was hired to voice impersonate him as McCoy for the remaining dialogue.
- Currently the national spokesvoice for American Airlines "We know why you fly" TV commercial campaign
- TV commercial for Quaker Instant Oatmeal (as Popeye) (voice) (1993).
- TV commercial, for Morning Funnies breakfast cereal, as the voice of Mr. Wilson (1989).
- Voice of Solar and other characters in in the online game Heat Fighter Turbo on www.plungeandplay.com
- Audio commentary: Futurama: The Beast with a Billion Backs (2008) (with Matt Groening, David X. Cohen, Billy West, John DiMaggio, Michael Rowe, Claudia Katz, Peter Avanzino and Lee Supercinski)
- Audio commentary: The Lost Adventure (2008) (with Matt Groening, David X. Cohen, Billy West, John DiMaggio, Michael Rowe, J. Stewart Burns and Lee Supercinski)
- Audio commentary: Futurama: Into the Wild Green Yonder (2009) (with Matt Groening, David X. Cohen, John DiMaggio, Patric M. Verrone, Michael Rowe, Lee Supercinski and Peter Avanzino)
- Became the signature commercial voice-over spokesman for Lexus in August of 2009.
- (2011) He played Ebenezer Scrooge in a Blackstone Audio production of Charles Dickens's "A Christmas Carol".
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