Ken Kang-Joh Jeong (pronounced Jung; born July 13, 1969) is a Korean American stand-up comedian, actor, voice artist, and former physician. He is best known for playing Ben Chang on the sitcom Community and the drug lord Leslie Chow in The Hangover film series. He was the lead in the ABC sitcom Dr. Ken, of which he is also the creator and for which he was a writer and executive producer. Jeong is a licensed physician but has stopped practicing in favor of his acting career. He currently appears as a panelist on both the American and British versions of the singing competition show The Masked Singer.