[3] He worked as a house surgeon at New Plymouth Hospital before setting up in practice in Blackball and later Greymouth and Christchurch.
[1] In 1935 he was the first non-British person to receive the Hunterian Society medal for his essay on midwifery in general practice.
In WWII he served again in the New Zealand Expeditionary Force as a medical officer with the rank Lieutenant Colonel.
[3][2] After the war Bennett completed study overseas from 1946 to 1947 and returned to Christchurch Hospital as an anaesthetist and assistant physician.
[3][5] In 1937 Bennett co-authored Gentlemen of the Jury with Doris Gordon opposing indiscriminate contraception and abortion, though he later distanced himself from the publication.