Lady Margaret Augusta Jennings Florey (Fremantle

Margaret Fremantle was born in Swanbourne, Buckinhamshire, in 1904. She was studying English, but transferred to physiology to satisfy her desire to study medicine.

She joined Florey's department of pathology at Oxford in 1936, and was a member of the team that demonstrated during World War II that penicillin was a potent antibiotic against pathogenic bacteria, but non-toxic to humans.

From 1945 until 1972, she was a lecturer in Pathology at Oxford. She died in 1994.