She served on the Royal Society of Medicine's section on Epidemiology and Public Health. In her career she worked at several hospitals including the Academic Department of Community Medicine at King's College Hospital Medical School, Denmark Hill, London and the London School of Hygiene and Tropical Medicine. In 1982 she served on the Faculty of Public Health Medicine of the Royal College of Physicians of the United Kingdom and at the Department of Community Medicine at St Thomas's Hospital Medical School in London.
The Inadequacy of Adolescent Health Statistics, Oxford Journal of Public Health (see)
- As early as 1902 Ballantyne had found an increase in the abortion rate in French and Austrian women working in tobacco factories. - Beulah R. Bewley, "Smoking in Pregnancy", British Medical Journal (Vol. 288, Issue #6415, pp 424–426, 11 February 1984)
- "There certainly was discrimination. They used to look at you and say she is married, or she has got children and if you were not married, they were expecting you to get married." (B. Bewley)
- "Promotion by tobacco companies may then be seen for what it is—the ‘pushing' of a dangerous drug." — B. Bewley (see)