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Maksim Aleksandrovich Chmerkovskiy is a Ukrainian-American dancer, choreographer, actor, and television personality. He is best known for his appearances on the American dance competition television series Dancing with the Stars, where he has been a professional dancer since the show's second season in 2005. He has also appeared on other television shows, including So You Think You Can Dance, Dancing with the Stars: All-Stars, and America's Next Dance Star.