In 1999, Paul Penkalski and Peter Dodson concluded that Ceratops, despite being is a nomen dubium because the material is too meager, appeared closely related to Avaceratops which even may be a juvenile Ceratops; there is not enough material to prove it.
With the help of Peter Dodson, Soloman Katz, Andrew Newberg, and Stephen Dunning, Grassie created the Philadelphia Center for Religion and Science (PCRS) to promote literacy in science and religion by hosting seminars, courses, and conferences.
An authority on Ceratopsians, he has also authored several papers and textbooks on hadrosaurs and sauropods, and is a co-editor of The Dinosauria, widely considered the definitive scholarly reference on dinosaurs.
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A professor of vertebrate paleontology and of veterinary anatomy at the University of Pennsylvania, Dodson has also taught courses in geology, history, history and sociology of science, and religious studies.
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In 2001, two former students named an ancient frog species, Nezpercius dodsoni, after him (as well as after the Native American Nez Perce people).
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You Hailu of Beijing's Chinese Academy of Geological Sciences, was a co-author with Xu and Makovicky in 2002 but, in 2003, he and Peter Dodson from the University of Pennsylvania published a separate analysis.