Norman Heatley, a scientist whose pioneering work on penicillin production helped save countless lives, has died. He was 92. Heatley died Jan. 5 at his home near Oxford in southern England, his family said. The cause of death was not disclosed. Alexander Fleming discovered penicillin, an antibiotic produced by mold, by accident in 1928. But it was Heatley and his Oxford University colleagues who produced enough for the first clinical tests on humans. Born in Suffolk, eastern England, in 1911, Heatley received a Ph.D. in biochemistry from Cambridge University.