Mark is the founder and manager of the Teenbeat label. He has been a member of Unrest, Air Miami, Grenadine, and Flin Flon. He co-wrote a song for Bastro, produced albums by Cold Cold Hearts and Tuscadero, and has been onstage with Luna, Superchunk, and Versus. His solo stuff is guitar pop. His electronic music series is entitled EM. He does graphic design under the moniker Timonium.