Neil H. Landman: Curator-in-Charge, Invertebrate Paleontology, American Museum of Natural History; PhD, Yale University, 1982; Researcher in ammonoid paleobiology, systematics, and biostratigraphy. Richard Arnold Davis: Professor of Biology and Geology, College of Mount St. Joseph; PhD, The University of Iowa, 1968; Researcher in the biology and taphonomy of fossil and present day cephalopods. Royal H. Mapes: Professor Emeritus, Ohio University; PhD, The University of Iowa, 1977; Researcher in cephalopod systematics, phylogeny, taphonomy, and paleobiology