
author
b. 1876
A pioneering American entomologist and parasitologist, he helped shape early scientific writing on insects and parasites that affect human health. His books brought together practical biology and public health at a time when medical entomology was still taking form.

by William A. (William Albert) Riley, O. A. (Oskar Augustus) Johannsen
Born in 1876, William A. Riley is best known as an American scientist and writer on entomology and parasitology. Surviving library and bibliographic records link him to important early works including Notes on Animal Parasites and Parasitism (1912), Handbook of Medical Entomology (1915, with Oskar Augustus Johannsen), Guide to the Study of Animal Parasites (1930), and Introduction to the Study of Animal Parasites and Parasitism (1933).
The preface material preserved in library collections shows that Handbook of Medical Entomology grew out of lectures he gave in the Department of Entomology at Cornell University. That fits the broader picture of Riley as a teacher as well as a researcher, writing books meant to organize a fast-growing field for students and specialists alike.
Bibliographic sources identify his lifespan as 1876–1963. While detailed personal information is scarce in the sources I could confirm, his published work clearly places him among the early twentieth-century scholars who helped define the study of disease-carrying insects and animal parasites.