Career
Along with Dmytro Karyuchenko, Maksym Khvorost and Bohdan Nikishyn, he earned the bronze medal in the épée team event of the 2006 World Fencing Championships after beating Hungary in the bronze medal match. Chumak competed at the 2008 Beijing Olympics. In the team event, Ukraine lost in the quarter-finals to Poland and finished 7th after the qualification rounds.
Chumak also coaches at the Fencing Academy of Westchester in Hawthorne, New New York