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| Jack Sepkoski | |
|---|---|
| Name | Jack Sepkoski |
| Birth date | 1948-06-09 |
| Birth place | Chicago, Illinois, United States |
| Death date | 1999-03-31 |
| Death place | Madison, Wisconsin, United States |
| Nationality | United States |
| Fields | Paleontology, Paleobiology, Geology |
| Workplaces | University of Chicago, University of Wisconsin–Madison, Field Museum of Natural History |
| Alma mater | University of Chicago (Ph.D.), University of Chicago (A.B.) |
| Known for | Compendium of Fossil Marine Animal Genera; work on mass extinctions; biodiversity curves |
| Awards | Guggenheim Fellowship, Paleontological Society Medal |
Jack Sepkoski was an American paleontologist and paleobiologist noted for compiling large-scale fossil databases and for quantitative analyses of biodiversity and mass extinctions. He assembled the influential compendium of fossil marine animal genera and developed diversity curves that reshaped research on Phanerozoic evolution, extinction events, and macroevolutionary patterns. His work bridged institutions such as the Field Museum of Natural History, University of Chicago, and University of Wisconsin–Madison and influenced generations of researchers in paleontology, evolutionary biology, and earth sciences.
Sepkoski was born in Chicago, Illinois and grew up during the postwar period that saw expansion of scientific institutions such as the Smithsonian Institution and the American Museum of Natural History. He earned his undergraduate and doctoral degrees at the University of Chicago, where he was trained in stratigraphy and paleontology under mentors linked to traditions at the Field Museum of Natural History and influenced by figures associated with the Geological Society of America and the Paleontological Society. His doctoral work situated him within networks connected to researchers at Harvard University, Yale University, and the University of California, Berkeley.
Sepkoski held appointments at the University of Chicago and later at the University of Wisconsin–Madison, and he maintained curatorial and research ties with the Field Museum of Natural History. During his career he collaborated with scholars from institutions including Stanford University, Massachusetts Institute of Technology, Oxford University, and the Natural History Museum, London. He served in roles that connected academic departments, museum collections, and funding agencies such as the National Science Foundation and foundations like the Guggenheim Fellowship program that supported comparative paleobiological work.
Sepkoski is best known for creating the compendium of fossil marine animal genera, an extensive database synthesizing taxonomic and stratigraphic information from primary literature, museum catalogs, and monographs. The compendium aggregated records relating to trilobites, brachiopods, bivalves, gastropods, cephalopods, corals, echinoderms, and other marine taxa discussed in journals such as the Journal of Paleontology, Paleobiology, and the Proceedings of the National Academy of Sciences of the United States of America. His synthesis drew on collections and investigators at the Field Museum of Natural History, Smithsonian Institution, and university museum holdings at Columbia University and University of Michigan. The dataset underpinned quantitative paleobiology research by enabling comparisons across geologic stages, formations, and regions cited in literature from the Paleozoic, Mesozoic, and Cenozoic eras.
Using the compendium, Sepkoski developed diversity curves and statistical approaches to identify periodicities and pulses in Phanerozoic biodiversity, contributing to debates about mass extinction events including the Permian–Triassic extinction event, the Cretaceous–Paleogene extinction event, and earlier Paleozoic crises such as the Late Ordovician mass extinction. He collaborated with researchers at institutions like Columbia University and Harvard University to explore drivers of biodiversity change, including discussions invoking extraterrestrial causes aligned with hypotheses debated after the discovery of the Chicxulub crater and research on bolide impacts. His analyses stimulated work on ecological incumbency, origination and extinction rates, adaptive radiations, and recovery dynamics examined by scholars at the University of California, Santa Barbara, Princeton University, and Yale University. Sepkoski's methods influenced subsequent studies using modeling frameworks developed in collaboration with researchers linked to the Santa Fe Institute and comparative macroevolutionary analyses appearing in venues such as Science and Nature.
Sepkoski received recognition including a Guggenheim Fellowship and posthumous honors from professional societies such as the Paleontological Society. His compendium and quantitative contributions altered curricula and research programs at departments in the United States and internationally at universities like University College London and the University of Tokyo. The database became foundational for projects integrating fossil occurrence data with phylogenetics and paleoenvironmental proxies pursued at centers including the National Center for Ecological Analysis and Synthesis and influenced synthetic works by authors affiliated with the Royal Society and major journals including Geology.
Sepkoski's personal collaborations connected him with colleagues and students across museums and universities including the Field Museum of Natural History, University of Chicago, and University of Wisconsin–Madison. His legacy persists through the compendium, which continues to be used and extended by researchers at institutions such as the Paleobiology Database initiative and in studies by scientists at Stanford University, Columbia University, and the Smithsonian Institution. Memorial symposia, dedicated sessions at meetings of the Geological Society of America and the Paleontological Society, and citations in influential reviews reflect his enduring impact on how paleontologists quantify macroevolutionary patterns.
Category:American paleontologists Category:1948 births Category:1999 deaths