Ingall received his medical education at the Westminster Hospital and qualified with the conjoint diploma in 1952. He gained the London MB BS in the following year. After holding house posts at the Westminster Hospital and surgical registrarships there and at the Royal Portsmouth Hospital, he moved to the United States, where he was Associate Dean and Assistant Professor of Surgery at the State University of New York at Buffalo. He was also Program Director, Regional Medical Program for West New York and consultant surgeon to the Sisters of Mercy Charity Hospital. He later practised as a general and urological surgeon at Grosse Pointe, Michigan. Jack Ingall died on 26 April 1994 in Hemel Hempstead Hospital, and there was a memorial service at St Alban's.