David Gillette

David Gillette (third from the left on the back row, wearing an orange cap) and other paleontologists at Grand Canyon National Park, 2019

David D. Gillette (March 20, 1946 – February 10, 2025) was an American paleontologist best known for his discovery of the dinosaur Diplodocus hallorum in 1985, and more recently for his work studying Pleistocene megafauna such as glyptodonts. At the time of its discovery, Diplodocus hallorum was the longest dinosaur known.