His brother, Marius Eriksen, Jr. (1922–2009), was an alpine skier and during World War II became a fighter ace in the Royal Norwegian Air Force.

[1] Eriksen won the gold medal in the giant slalom at the 1952 Winter Olympics, which was held in Oslo, Norway.

Eriksen was the first male alpine ski racer from outside the Alps to win an Olympic gold medal.

[7] Following his racing career, he was the ski school director at various resorts, such as Boyne Mountain and Pine Knob,[8] both in Michigan,[9] Sugarbush in Vermont, Heavenly Valley in California, Snowmass and Aspen in Colorado, and Park City in Utah.

[10] At the time of his death he was the director of skiing at the Deer Valley Resort in Utah, and also served as host of the Stein Eriksen Lodge, a ski lodge in Deer Valley (not owned by Eriksen, but named in his honor).