Mary Keenan was born in Orange in the 1885 to Thomas and Mary Keenan of Amaroo. She trained at St Vincent’s Hospital from 1906 to 1909, after which she worked as a Sister at the Metropolitan Private Hospital, followed by Theatre Sister at Garrison Hospital, Sydney.
Sister Keenan served in Egypt, France and London, returning to Sydney in late 1919. She remained active in the nursing service and was Secretary of the St Vincent’s Hospital ex-trainees in 1940. She was also popular in the Sydney Catholic social scene.
Mary Keenan died in Sydney on 26 May 1955. Her funeral service was held at St Joseph’s Church in Orange on Saturday 28 May 1955, after which she was interred in the Keenan family vault in Orange Cemetery.