His early short stories appeared in Smith's Weekly and The Bulletin under the pseudonym, 'Freddie'. His stories were later republished in anthologies such as Coast to Coast,1959-60; The Bulletin Christmas Edition, 1958; The Penguin Book of Australian Short Stories (Vol 2); Selected Australian Stories (1963); Australian Short Stories, Second Series (1963); and Short Stories from the Second World War (1982).
Lusby enlisted in the Royal Australian Airforce in 1941, was posted with the No. 3 Squadron RAAF to fight in North Africa and Middle East, and was 'loaned out' to No. 458 Squadron. Jack was the elder brother of radio pioneer Maurice Lusby, and trailblazing Australian Army Doctor Gwen (Lusby) Fleming. His younger brother Bob died as a PoW on the Burma Railway.