He appeared in Michael Bay 's Pain & Gain (2013), as Johnny Wu, a motivational speaker. Ken Jeong is an American actor, comedian, and physician. Ken Jeong is a Korean-American actor, comedian and physician, best known for his role as the comedic gangster Leslie Chow in 'The Hangover' film franchise. Ken Jeong plays Asian mobster Mr. Chow in both The Hangover and The Hangover Part II.Jeong currently plays the recurring role of angry Spanish teacher Señor Chang on the NBC comedy series "Community." He is known for his roles as Ben Chang on the critically acclaimed NBC/Yahoo! He will next be seen in Michael Bay's "Transformers: The Dark Side of the Moon," and the comedy "The Zookeeper," opposite Kevin James, both opening in July. sitcom Community (2009) and gangster Leslie Chow in The Hangover (2009) Trilogy.