From his humble beginnings with Toronto Canoe Club as a teenager, to his years with the Abitibi Paper Co. in Iroquois Falls, Kerr was a standout goalie with a lightning fast right hand and extraordinary eyesight. He moved to Montreal, and guarding the AAA net won the Allan Cup in 1930. He signed with the Maroons later that year, but in 1934, after bouncing up and down between the NHL and the farm team, he was sold to the Americans to replace Andy Aitkenhead. It was there he played the last seven years of his career and achieved his greatest glory.
While he came close to personal and team success, it wasn't until 1939-40 when everything fell into place for Kerr. He won the Vezina Trophy, was elected to the First All-Star team, took the team on a league-record 19-game unbeaten streak, played all 48 games for the Blueshirts, and led the Rangers to a Stanley Cup victory over Toronto. He later invested in hotels in Belleville, one of which he later leased to the Ontario Ministry of Health for a pilot self-care test, before selling them in the mid-1960s.