Simon Flexner (1863-1946), US pathologist. Flexner taught at Johns Hopkins University and the University of Pennsylvania before becoming the first dir

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Simon Flexner (1863-1946), US pathologist. Flexner taught at Johns Hopkins University and the University of Pennsylvania before becoming the first director (1901 to 1935) of the Rockefeller Institute for Medical Research and a trustee of the Rockefeller Foundation. Flexner worked on experimental epidemiology and venoms, poliomyelitis, serum treatment of cerebrospinal meningitis, and for isolating a bacillus of dysentery (Shigella dysenteriae). The bacterium Shigella flexneri was named in his honour.

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