With Siobhan Heekin-Canedy, he is a three-time Ukrainian national champion and placed as high as 14th at the World Championships.

They made their ISU Junior Grand Prix debut in the 2004–05 season.

Their Worlds placement gave Ukraine a spot in the ice dancing event at the 2014 Winter Olympic.

Dun retired from competition on March 31, 2014 and moved with his wife to Chicago, Illinois.

Dun entered the show skating world and is currently the pair team with partner Mickayla Lindberg at Busch Gardens in Tampa FL.