Mary Mayeur was born in London on 16 July 1910, the daughter of Eugene Francois Mayeur, the actor, and Helen (née MacArthur). She was educated at St Paul's Girls' School (foundation scholar) and at the Royal Free Hospital, winning scholarships and prizes and qualifying in 1933 with a distinction in obstetrics and gynaecology. She was a resident at the Royal Free, and trained in obstetrics and gynaecology, obtaining an MD in 1934, the FRCS and MRCOG in 1938 and becoming FRCOG in 1953. Victor Bonney and Charles McIntosh Marshall both influenced her during her training. During her appointment to the Liverpool Maternity Hospital in the second world war she gave heroic service under frequent bombing of the docks nearby. In 1944 she was appointed consultant to Wigan Infirmary and Stanley Hospital and then the Liverpool Maternity and the Liverpool Women's Hospitals. Later she established and then ran a unit at Ormskirk General Hospital for twenty years. She held examinerships in the Royal College of Obstetricians and Gynaecologists, the Central Midwives Board and in the University of Liverpool. She retired to Sussex in 1970, having interests in the Women's Institute and rose-growing. She is thought to have died sometime in 1988.