The son of actor Jason Alexander, Gabe grew up performing all over Los Angeles. Gabe spent his summers at French Woods Festival of the Performing Arts studying acting, improv, and circus before heading to Yale to earn his B.A. in Theater Studies. Post-graduation, Gabe moved back to LA and began performing at comedy theaters such as iO West and UCB. He co-founded sketch comedy group "The Idiot Chimney" and co-created the Freeform digital series "Dinner With Dad," before performing in several parody musicals both with UCB group "Quick and Funny Musicals" and elsewhere.