Harrison began performing stand-up comedy while studying psychology and English at Harvard. A summa cum laude graduate, Harrison was the co-founder of the Harvard College Stand-Up Comic Society (or "Harvard College SUCS," as the group's name is cheekily acronymized), the first organization at Harvard dedicated to the performance and appreciation of stand-up comedy and one still popular on campus today.
Now living in Manhattan, Harrison has quickly become one of the most in-demand comedians in New York, performing in more than 600 shows a year and thus leading the NY Daily News to call him "the hardest-working man in comedy." One of Comedy Central's "Comics to Watch," Harrison has also received many awards and honors for his comedy, including the Andy Kaufman Award (2010) for creativity and originality in comedy, the Shorty Award in collaboration with Comedy Central and the New York Comedy Festival for "Best Emerging Comic" (2011), and the Magners Comic Stand-Off (2011).
On television, Harrison is the warm-up comic for Katie, Katie Couric's daytime talk show on ABC. He has also been featured on SPIKE TV, the Discovery Channel, the Science Channel, and SiriusXM Satellite Radio. The co-host of the official Times Square New Year’s Eve World Wide Webcast in 2010, Harrison broadcasted live to over 250 million viewers around the globe. Internationally recognized for his talent, Harrison was the head writer for Tu Nite con Lorenzo Parro, the first-ever late night show on NBCU/Telemundo; was a featured correspondent on the Japanese television show, Scooper, which was broadcast nationally on Nippon TV; and was a featured act in the Magners Glasgow International Comedy Festival in Scotland.
Harrison also headlines comedy clubs around the country, including sold-out shows at TBS Just for Laughs Chicago and the legendary Carolines on Broadway (leading Punchline Magazine to name Harrison one of the “Breakout Artists” of the year). Harrison has also been featured in a wide variety of national and international publications, including being highlighted for the "Joke of the Week" in TimeOut NY and being featured in the New York Times, the Wall Street Journal, the Boston Globe, and CNBC.com.
Harrison's one-man show, Harrison Greenbaum: What Just Happened?, debuted at the legendary New York comedy hotspot, the Upright Citizens Brigade Theatre, before commencing an Off-Broadway run and national tour.
Harrison is a talented comedy writer as well. He is a nationally published author (with selections printed in the books, 50 Successful Harvard Essays, 2nd ed., and How They Got Into Harvard) and has been a writer for MAD Magazine since 2005.
From colleges to comedy clubs, from talk shows to theaters, Harrison is bringing his unique style of comedy to audiences across the country and around the world, proving each night why publications such as Newsday have named him one of “today’s best.”