A physicist who worked on crystallography.[ref]
https://journals.iucr.org/a/issues/1986/01/00/a25312/a25312.pdf. Acta Crystallographica A 42 (1986), obituary, printed p. 4: mathematical physics lectureship and physics professorship
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Paul Peter Ewald (1923–2019) was an influential American microbiologist and biochemist known for his work in the fields of microbial genetics, molecular biology, and the study of bacterial viruses (bacteriophages). He made significant contributions to the understanding of genetic exchange in bacteria and the mechanisms behind bacterial evolution and resistance.