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Overview Joseph Leidy, 1823-1891, one of the great American scientists of the 19th century, possessed a vast knowledge of the natural world. Best known as the father of American vertebrate paleontology, he also pioneered the fields of parasitology and protozoology, and was the preeminent anatomist of his time. He brought much of his knowledge together as an influential teacher of natural history. While teaching zoology at the University of Pennsylvania and at the Medical Department, Leidy constructed...