Paul Opler

Paul Alexander Opler (3 August 1938 – 6 February 2023) was an American entomologist and lepidopterist best known for his Peterson Field Guides to the butterflies of eastern and western North America, his pioneering role as the first entomologist in the U.S. Fish and Wildlife Service's Endangered Species Program, and his presidency of the Lepidopterists' Society. He was a Fellow of both the Entomological Society of America and the Royal Entomological Society.