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.

Dungjen’s first skating partner was his sister, Susan Dungjen. Together, they won silver medals at the 1983 NHK Trophy, 1984 World Junior Championships, and 1984 Grand Prix International St. Gervais. After their partnership ended, he competed with Paula Visingardi and Karen Courtland.

Jason Dungjen (born September 28, 1967) is an American figure skating coach and a former pair skater. With Kyoko Ina, he is a two-time Skate America silver medalist, a three-time Nations Cup medalist, and a two-time U.S. national champion. With Susan Dungjen, he is the 1983 NHK Trophy silver medalist and 1984 World Junior silver medalist.