who is credited with discovering penicillin?
International Historic Chemical Landmark. 1  Contents. 2  Alexander Flemingâs Discovery of Penicillin. 3  Penicillin Research at Oxford University. 4  Penicillin Production in the United States during WWII. 5  Increasing the Yield of Penicillin. 6  U.S. Pharmaceutical Companies Support Production. 7  Scaling-up Penicillin Production.