Gadsby began his outstanding hockey career in Calgary playing for several minor league teams including the Alberta Midget champions in 1942. He played two years for the Edmonton Junior Canadians before joining the Chicago Black Hawks in 1946. He was captain twice during his eight years with them. Gadsby contracted polio in 1952 but fought back without interrupting his hockey career,[2] although he spent three weeks in the hospital. That was not his first brush with danger, however—in 1939 he was travelling with his mother on the passenger liner Athenia when it was hit by a torpedo fired by a German U-boat and sank, and he and his mother spent several hours in a lifeboat before being rescued.[3]
Gadsby was a First Team All-Star three times and a Second Team All-Star four times. In 1958–59, he set a record for assists by a defenceman, with 46.[4]
Despite a long (20 seasons) NHL hockey career, Gadsby never won the Stanley Cup. He came closest to winning the Cup in 1964, when the Detroit Red Wings lost a seven-game final series to the Toronto Maple Leafs.
When he retired he was the leading career scorer among defencemen with 568 points.
Gadsby was an "Honored Member" of the Detroit Red Wings Alumni Association, and was active in its efforts to raise money for children's charities in Metro Detroit.
He would also return to Canada in the Hockey Offseason to play Baseball for the Calgary Buffalo for parts of three seasons from 1950 to 1954.