Millet has supervised computational studies of three body celestial mechanics and, in the context of complexity theory, the use of cellular automata to model traffic flow. Students have worked with him on small observatory activities such as CCD imaging, and the manipulation and analysis of images using IRAF.
His published work can be found in the American Journal of Physics, Physical Review, Physica, Physical Review Letters, Journal of Acoustical Society of America and The Physics Teacher. Millet has been a member of the Hamilton College faculty for more than 30 years. He earned a Ph.D. from Syracuse University.