In 1979, Blumberg/Seibert were awarded the bronze medal at their first U.S. Championships, having finished third behind Stacey Smith / John Summers and Carol Fox / Richard Dalley. The following year, they passed Fox/Dalley to take the silver medal behind Smith/Summers at the 1980 U.S. Championships in Atlanta. They were included in the U.S. team to the 1980 Winter Olympics in Lake Placid, New York. After placing 7th at the Olympics, the two concluded their season with a 6th-place result at the 1980 World Championships in Dortmund, West Germany.