He played junior hockey for the Calgary Centennials and was drafted 48th overall by the Chicago Blackhawks in the 1969 NHL Amateur Draft. Maggs took a year off to attend and play for the University of Calgary before embarking on his pro career in 1970. After a year with the Dallas Black Hawks Maggs made the Chicago lineup in 1971-72. But the next season he was traded to the California Golden Seals for Dick Redmond and Bobby Sheehan. A five game tryout with the Toronto Maple Leafs in 1979-80 did not result in a roster spot so Maggs retired.