Jim Gardiner was born in Ballarat on 5 May 1922. He studied medicine at the University of Melbourne, where he met his future wife Jenny, and received his Doctor of Medicine degree in 1948.
From 1945 to 1947, Jim was a Resident Medical Officer at Royal Melbourne Hospital, after which he took up the position of Assistant Pathologist at The Alfred Hospital in Melbourne. In 1949, he moved to London, where he was a Registrar at the Brompton Hospital for Consumption and Diseases of the Chest.
