His fascination with the past and his innate ability to locate and meticulously excavate prehistoric cemeteries and burial mounds soon led him into a career as a self-taught professional archaeologist, first with the Gilcrease Museum in Tulsa, Oklahoma; then with the Foundation for Illinois Archeology in Kampsville, Illinois; and finally with the Museum of the Red River in Idabel, Oklahoma.
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In Illinois, he is well known for his numerous excavations of Middle and Late Woodland, and Mississippian mortuary sites in the Illinois, Mississippi, and Kaskaskia River valleys.
Gregory Peck | Gregory of Tours | Order of St. Gregory the Great | Gregory Bateson | Pope Gregory VII | Gregory of Nyssa | Pope Gregory XIII | Pope Gregory XVI | Lady Gregory | Gregory S. Paul | Gregory Corso | Pope Gregory XV | Gregory of Nazianzus | Pope Gregory XI | Philippa Gregory | Gregory the Illuminator | Gregory Olsen | Gregory Blaxland | Dick Gregory | Pope Gregory I | Gregory Reinhart | Gregory Deyermenjian | Gregory Crewdson | Gregory Benford | Francis Thomas Gregory | Andre Gregory | Pope Gregory X | Pope Gregory VI | Jack Gregory | Gregory Thaumaturgus |