H. Ralph Jackson is an American paleontologist known for his work in the field of vertebrate paleontology. He has contributed significantly to the understanding of prehistoric life, particularly through his research on dinosaur fossils and their environments. His studies often focus on the evolutionary history of reptiles and the ecological dynamics of ancient ecosystems. In addition to his research, Jackson has been involved in various educational initiatives, promoting the importance of paleontology and science education. He has published numerous scientific papers and has participated in fieldwork that has helped uncover important fossil sites, enhancing our knowledge of the Mesozoic Era and its inhabitants.