Margaret Augusta Jennings, Baroness Florey (née Fremantle;[1] 2 December 1904, Swanbourne – 14 November 1994) was a British scientist who was part of the group at the University of Oxford under Howard Florey who worked on the clinical application of penicillin.
Jennings read Philosophy, Politics, and Economics at Lady Margaret Hall, Oxford, from 1924.
[2] She joined the University of Oxford's Sir William Dunn School of Pathology under Howard Florey in 1936.
[3] By 1938, she was part of the team led by Florey investigating the production and applications of penicillin.
[4] As part of testing, Jennings assayed the toxicity of penicillin extracts against white cells of the blood.