John "Jack" Horner (born June 15, 1946) is a paleontologist. He is famous for the discovery of Maiasaura, supervising the Jurassic Park films and being responsible for the idea of the Chickenosaurus project (Source 1). He also discovered MOR 1125 with Mary Schweitzer.
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1. http://www.wired.com/medtech/genetics/magazine/17-03/st_qa