Henry Fairfield Osborn
Osborn named and wrote the first descriptions of Tyrannosaurus rex and Velociraptor, and many other dinosaurs. The historian Edward J. Larson described Osborn as "a first-rate science administrator and a third-rate scientist." This seems rather an extreme view: some of the problems he faced are still problems today. For example, he studied Struthiomimus, which is a lightweight running dinosaur. Its lifestyle is still not very clear today.