John Cassin

Born in Pennsylvania in 1813, John Cassin became one of the leading American ornithologists of his time. He was closely associated with the Academy of Natural Sciences of Philadelphia, where he served as curator and later vice president, working especially on the classification of the academy's large bird collections.

Cassin is remembered for describing many bird species and for publishing important works on North American and world birds. His research helped expand scientific knowledge of bird diversity at a time when collections from expeditions and trade were rapidly increasing.

He was also involved in broader scientific life in the Philadelphia region and helped found the Delaware County Institute of Science. Cassin died in 1869, but his name lives on in several bird names and in the history of American ornithology.