[2] Fisher entered the Anglican Society of Saint Francis (SSF) in 1944 and took Michael as his religious name.
He worked initially with the Student Christian Movement and was, successively, the Guardian of Alnmouth Friary, Minister General of the Society of Saint Francis[5] and general secretary of the United Society for the Propagation of the Gospel (USPG).
A 2016 Church of England enquiry reported that in 1978 Fisher had behaved inappropriately when a young man approached him concerning sadistic abuse that he had suffered from another clergyman.
In the last part of his life he lived at the Franciscans' house in Cambridge where he had a ministry as adviser and spiritual director to a large number of people and regularly celebrated and preached at St Bene't's Church.
He published his memoirs, For the Time Being, in 1993 as Michael Fisher SSF (combining his name in religion with his surname).