[4] He entered the University of Sydney in 1906,[1] graduating his Bachelor of Medicine (MB) in 1910,[5] and Master of Surgery (ChM) in 1912.

[6] After completing his two-year residency at Royal Prince Alfred Hospital in Sydney, he established at general practice in Parkes, New South Wales.

[1] During the Great War, Walker joined the Australian Army Medical Corps as a captain on 1 July 1916,[8] and served in Australia.

He was a councillor of the New South Wales branch of the British Medical Association from 1934 to 1939, and was the first honorary secretary of the Royal Australasian College of Physicians from 1938 to 1944, after which he was a council member from 1944 to 1956, and served as its vice president from 1948 to 1950.

[1][10][11] He returned to Australia in December 1941, and was appointed a consultant physician to Headquarters, Allied Land Forces, South West Pacific Area, with the rank of colonel.

[1] The committee resolved to give priority to the writing of clinical volumes, to disseminate the medical lessons of the war as widely and rapidly as possible.

[12] Walker died from cerebrovascular disease at Royal Prince Alfred Hospital on 8 January 1958, and his remains were cremated.