Thomas Greenslade has been a member of the Kenyon College faculty since 1964. During the last thirty years, he has become the country's academic physicist most closely identified with the study of nineteenth-century physics apparatus. Greenslade has lectured extensively on nineteenth-century physics, photography, and how physics was taught and learned in nineteenth-century schools. His research findings on those subjects have resulted in nearly 200 articles on the history and teaching of physics. Since the mid 1970s, Greenslade has published a yearly series of nearly sixty articles under the title "Nineteenth Century Textbook Illustrations" in The Physics Teacher. In 1987, his work was recognized with a Distinguished Service Citation from the American Association of Physics Teachers. Greenslade has also been the recipient of several grants from the National Science Foundation and the Howard Hughes Medical Institute. In 1997, Kenyon honored him with a Robert J. Tomsich Science Award in recognition of his outstanding research.