caption death_date death_place birth_place image_size nationality field work_institutions birth_date signature prizes image article_title name
joseph leidy '' circa '' 1870 30 april 1891 philadelphia , pennsylvania , united states philadelphia , pennsylvania , united states 175px american paleontology , anatomy , parasitology academy institute of science of natural sciences university of pennsylvania wagner free 09 september 1823 joseph leidy signature.jpg lyell medal -lrb- 1884 -rrb- joseph leidy by gilbert studios c1870.jpg joseph leidy
 joseph leidy
joseph leidy

joseph leidy -lrb- september 9 , 1823 -- april 30 , 1891 -rrb- was an american paleontologist .
leidy was professor of anatomy at the university of pennsylvania , and later was a professor of natural history at swarthmore college .
his book `` extinct fauna of dakota and nebraska '' -lrb- 1869 -rrb- contained many species not previously described and many previously unknown on the north american continent .
at the time , scientific investigation was largely the province of wealthy amateurs .
