After attending Brighton High School Janet was one of the first women allowed to study medicine, gaining her medical degree from the London School of Medicine for Women in 1904.
She then worked as a surgeon at the Royal Free Hospital and the Belgrave Hospital for Children (one of the few London hospitals to employ women). She went on to become the Senior Medical Officer for Maternity and Child Welfare at the Ministry of Health and, from 1907, Chief Woman Medical Adviser to the Board of Education. She participated in the suffragette “vanishing for the vote” campaign of 1911.
In 1923 Janet contributed to the Hadow Report, The Differentiation of the Curriculum for Boys and Girls. She took particular interest in maternal death, vaccination, and child protection.
Janet was awarded the DBE in the “Birthday Honours for Child Welfare Workers” Maternity and Child Welfare (July 1924).
In 1927, she delivered a course of lectures at the Kings College, London, on “Maternal Mortality”, saying “We need more study and better investigation into the cause of this tragedy” and suggesting subsidised midwifery services and postnatal clinics as two possible solutions.
Now a leading public figure, Janet visited Australia in 1929, to consult on maternal and child health policy.
In 1934 she married Michael Heseltine, registrar of the General Medical Council, and therefore had to resign her civil service job.
In 1937, following the fascist bombings of the Basque region of Spain, particularly Guernica, she assisted orphaned Basque children.
In 1938, she chaired the Public Health Committee of the International Council of Women, presenting a report on malnutrition.
Campbell served on the Health Committee of the League of Nations. During World War II, she was a member of the War Cabinet’s Committee of Women in Industry. Campbell was a founding member of the Medical Women’s Federation, and served a term as the federation’s president from 1944 to 1946. She was also a justice of the peace in Surrey and Gloucestershire.
She died after a long and painful illness at a nursing home in Highgate in 1954, aged 77 years.
An obituary for Janet can be accessed here.