Dungjen began competing with Kyoko Ina in the 1991–92 season. They won the 1997 and 1998 U.S. Championships and placed fourth at the 1998 Winter Olympics. They withdrew from the 1998 World Championships after an accident during a practice session — while practicing a triple twist, Ina's arm hit Dungjen's forehead, fracturing the browbone above his right eye. Their partnership dissolved after the event and he retired from competition. Dungjen later skated with Yuka Sato on the Stars on Ice tour.