Tim Marrs

Timothy Clive Marrs (27 August 1945 – 1 November 2025) was an English toxicologist who advised governments and international agencies on poisons, organophosphate insecticides and carcinogenic substances in food.

A Fellow of the Royal College of Pathologists and of the British Toxicology Society, he held senior roles at Porton Down and the Food Standards Agency.

Early life and education Timothy Clive Marrs was born in Edenbridge, Kent on 27 August 1945, to Wallace Myers Marrs and Barbara Hobson. He was educated at Tonbridge School, Tonbridge, Kent from 1958 and graduated in 1963. Marrs then studied at Westminster Hospital Medical School and qualified in 1968 with a MB BS. He continued his studies in 1970 in pathology at Westminster Hospital Medical School until 1975.

Selected publications Chemical Warfare Agents: Toxicology and Treatment. Marrs T.C., Maynard, Robert L. and Sidell, Frederick. John Wiley, Chichester. 1996; General and Applied Toxicology. ed. Ballantyne B., Marrs T.C. and Syversen, T. Macmillan/Stockton Press Ltd. 1999; Organophosphates and Health. Karalleidde L.K., Feldman S.J., Henry J. and Marrs T.C. London, Imperial College Press. 2001 Toxicology of Herbicides. Marrs T.C. John Wiley, Chichester. 2003. Pesticide Toxicology and International Regulation. Marrs T.C. and Ballantyne B. John Wiley, London. 2004.