It was an interesting time to work as a psychiatrist: the First World War had seen ground-breaking work in diagnosing and treating trauma, and with battle casualties arriving home, Patrick de Maré had plenty of patients to look after and study.
Northfield became the centre of a series of experiments led by these eminent physicians, which studied how to deal with trauma caused by war.
He also worked with Benaim and Lionel Kreeger at Halliwick Hospital, the short-lived therapeutic community.
In 1960, Wilfred Foulkes and Patrick de Maré established a private clinic, the Group-Analytic Practice.
After a long and debilitating illness resulting from a street accident he eventually died from pneumonia at the age of 92, survived by his wife, two daughters, and numerous grandchildren and great-grandchildren.