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In 2004, Mack became an apprentice with Joffrey Ballet in Chicago, and joined the American Ballet Theatre Studio Company the following year. In 2006, he started dancing with the Orlando Ballet as a principal. In 2009, after Bruce Marks, the director of the company left, he accepted The Washington Ballet's then-artistic director Septime Webre's invitation to join the company. He had also participated in the company's community outreach program. He was named Dance Magazine's "25 to Watch" 2012. He had also competed in several international competition, and in 2012, he won the senior gold medal Varna International Ballet Competition, and was the first African American to do so.