Aut Erickson split his four-year junior career evenly between the Lethbridge Native Sons and the Prince Albert Mintos of the WCJHL between 1954 and 1958. During that time, and especially in Prince Albert, the lanky blueliner established himself as a robust defender who had a touch for head-manning the puck.
In 1958-59, he turned pro with the Calgary Stampeders for a season before leaping to the top with the Boston Bruins where he completed two full campaigns of spot duty. His entry onto the NHL stage, however, bore little resemblance to his success in Western Canada. At the pro level, Erickson would suffer the wandering fate of most journeymen of his day.
Over the nine seasons that followed his departure from Boston, Erickson picked up the odd gig with various NHL clubs including the Chicago Blackhawks, Oakland Seals, and Toronto Maple Leafs. The latter outing consisted of only one game with the Blue and White during their Stanley Cup run of 1967. An appearance in that single contest got his name etched on the Cup.
In between NHL stops, he put in time with the Buffalo Bisons and Pittsburgh Hornets of the AHL plus the Victoria Cougars and Phoenix Roadrunners of the WHL. He retired from on-ice duty in 1969-70.
Afterwards, he stayed on to coach the Roadrunners for two seasons and then returned to the NHL as an assistant GM with the New York Islanders. After two years in the front office he co-coached the team with Earl Ingarfield for a short time before leaving hockey for good.