Overview John Percy Moore (1869-1965) was a Professor of Zoology at the University of Pennsylvania from 1912 to 1939, an Assistant Curator at the Academy of Natural Sciences from 1902 to 1938, and held several positions between 1920 and 1956 at the Ludwick Institute, which offered free lectures and courses in the natural sciences. He was also a world recognized authority on leeches. During his career, Moore named six genera, 229 species, five subspecies and four varieties of polychaetous annelids, or...

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...