Marie Charlotte Carmichael Stopes (15 October 1880 – 2 October 1958) was a British author, palaeobotanist, academic, campaigner for women's rights, advocate of eugenics and pioneer in the field of birth control. Her contributions to plant palaeontology and coal classification were significant, and she was the first female academic on the faculty of the University of Manchester. With her second husband Humphrey Verdon Roe she founded the first birth control clinic in Britain. Stopes edited the newsletter Birth Control News which gave explicit practical advice. Her sex manual Married Love was controversial and influential: it brought the subject of birth control into wide public discourse. She was never in favour of abortion, arguing that preventing conception was all that was needed.
Reginald Ruggles Gates (May 1, 1882 – August 12, 1962), was a Canadian born anthropologist, botanist, and geneticist. He did most of his work in the United Kingdom and the United States. He received his Bachelor of Science from McGill University with further education in Chicago and London. He did botanical work in Missouri in 1910 and later worked in London. He alternated between work in Britain and the United States. He won various awards and in 1931 was elected to the Royal Society.