David Harper is a leading expert on fossil brachiopods and numerical methods in palaeontology. He is Professor of Palaeontology in Durham University, Principal of Van Mildert College and Deputy Head of College Faculty (Research). He was previously Head of Geology in the Natural History Museum of Denmark. He has published over 10 books and monographs, including a couple of influential textbooks, as well as over 250 scientific articles and, together with Øyvind Hammer, the widely-used software package PAST.

Robert B. Blodgett is a geologist/paleontologist whose research is focused on Paleozoic and Mesozoic faunas of western North America, especially Alaska. His primary specializations are with gastropods and brachiopods, but his work in the Mesozoic also includes bivalves and foraminifera. He was formerly with the Branch of Paleontology & Stratigraphy of the U.S. Geological Survey, until the untimely demise of that unit in 1995, and he now works as independent consultant.

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