Paul J. Nahin is professor emeritus of electrical and computer engineering at the University of New Hampshire and the author of several books, including Mrs. Perkin's Electric Quilt and Other Intriguing Stories of Mathematical Physics, Chases and Escapes: The Mathematics of Pursuit and Evasion, and Oliver Heaviside: The Life, Work, and Times of an Electrical Genius of the Victorian Age, the last also published by Johns Hopkins.