Theodore D. A. (Theodore Dru Alison) Cockerell

Born in England in 1866, Theodore Dru Alison Cockerell went on to become a British-American entomologist and systematic biologist whose output was astonishing even by the standards of his own time. He is best remembered for his work on Hymenoptera, especially bees and wasps, and for describing large numbers of species from many parts of the world.

Cockerell's interests were never narrow. Alongside entomology, he worked in botany, zoology, and paleontology, and he spent much of his career associated with the University of Colorado. That broad range helps explain why his books and papers can feel so lively: they come from a scientist who was always looking beyond a single field.

He was married to Wilmatte Porter Cockerell, an entomologist and educator who also collected and studied specimens. Together they formed a notable scientific partnership, and his long career left a lasting mark on natural history through both the sheer number of his publications and the breadth of subjects he explored.