 He also finished fourth-fifth in the 15, 30 and 50 km events in 1964.Stefansson won a silver over 30 km at the 1962 FIS Nordic World Ski Championships in Zakopane.He also won the long distance cross-country ski race Vasaloppet on seven occasions between 1962 and 1969, only missing victory in 1967, when he finished second behind Assar Rönnlund.