Jeong gave up the practice in 2006 in favor of his acting career however, he maintains his medical license and has assisted with medical emergencies during performances and on-set. 2006–present: Full-time entertainer Įarly in Jeong's career, he studied with director Natalia Lazarus at the Los Angeles Performing Arts Conservatory where she coached him for his film debut in Knocked Up. Lazarus coached Jeong from 2006 - 2012 for all of his film and television roles through The Hangover Part II. Subsequently, he has appeared in Step Brothers 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. Jeong played Señor 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.