<P> Jeong won the Big Easy Laff - Off in 1995, of which NBC president Brandon Tartikoff and The Improv founder Budd Friedman were judges, and they both urged Jeong to move to Los Angeles . He began performing regularly at the Improv and Laugh Factory comedy clubs . After moving to Los Angeles, he initially practiced medicine for several years as a physician at a Kaiser Permanente hospital in Woodland Hills . </P> <P> Jeong's background in theater and improv started while he was still a medical student in North Carolina . He was a regular at open mic nights in the Raleigh - Durham circuit, performing at Charlie Goodnights in Raleigh and Tootie's Durham Comedy Club . He also emceed The Comedy Spot programming series on Duke University campus 1992 and 1993 (produced by his friend by coincidentially same - first named Korean - American, Kendrick Jahng) opening for Margaret Cho, Jeff Dunham and others . His stand up work has led to several television appearances, including NBC's The Office, HBO's Entourage and Curb Your Enthusiasm . </P> <P> He made his film debut in Judd Apatow's Knocked Up as Dr. Kuni, which proved to be his breakout performance . From that point forward he was able to transition from medicine into a full - time career in the entertainment industry . Subsequently, he has appeared in Pineapple Express; Role Models as King Argotron; All About Steve; The Goods: Live Hard, Sell Hard; Couples Retreat; and as Mr. Chow in The Hangover, The Hangover Part II, and The Hangover Part III . He co-starred in Zookeeper and Transformers: Dark of the Moon, released in summer 2011 . </P> <P> Jeong played Señor Ben Chang on the NBC sitcom Community and was nominated for the show's "Male Breakout Star" at the 2010 Teen Choice Awards . He was nominated for two 2010 MTV Movie Awards, winning the award for Best WTF Moment and for MTV Movie Award for Best Villain for The Hangover . In fall 2010, Adidas basketball began a wide - ranging marketing campaign in which he starred as "Slim Chin", alongside NBA stars Dwight Howard and Derrick Rose . On May 22, 2011, he hosted the 2011 Billboard Music Awards in Las Vegas on ABC and was featured in a Hands Only CPR PSA campaign from the American Heart Association on June 15, 2011 . </P>

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