Howard Walter Florey, Baron Florey OM FRS FRCP (24 September 1898 – 21 February 1968) was an Australian pharmacologist and pathologist who shared the Nobel Prize in Physiology or Medicine in 1945 with Sir Ernst Boris Chain and Sir Alexander Fleming for his role in the development of penicillin.Although Fleming received most of the credit for the discovery of penicillin, it was Florey who carried out the first ever clinical trials in 1941 of penicillin at the Radcliffe Infirmary in Oxford on the first patient, a Postmaster from Wolvercote near Oxford.