He co-founded the Propergander theater group with a few LCC alumni. Their first production was of "The Achievers" by LCC co-founder Michael Golamco in 2001. Around this time, Park began doing stand-up comedy recreationally in his backyard during Propergander shows. He cited Mike Birbiglia and Mitch Hedberg as early influences and would later perform alongside comedian Ali Wong. Other notable alumni include Vivian Bang, Tim Chiou, Samantha Quan, and Eddie Shin. Park, Shin, and LCC co-founder Naoya Imanishi were also a part of the short lived improv group, "The Legendary Stage Ninjaz," along with comedian Ali Wong.