Tom Hayes reached electronics via a circuitous route that started in law school and eventually found him teaching Laboratory Electronics at Harvard, which he has done for twenty-five years. He has also taught electronics for the Harvard Summer School, the Harvard Extension School, and for seventeen years in Boston University's Department of Physics. He shares authorship of one patent, for a device that logs exposure to therapeutic bright light. He and his colleagues are trying to launch this device with a startup company named Goodlux Technologies. Tom designs circuits as the need for them arises in the electronics course. One such design is a versatile display, serial interface and programmer for use with the microcomputer that students build in the course. Paul Horowitz is a Professor of Physics and of Electrical Engineering at Harvard University, where in 1974 he originated the Laboratory Electronics course from which emerged The Art of Electronics. In addition to his work in circuit design and electronic instrumentation, his research interests have included observational astrophysics, X-ray and particle microscopy, and optical interferometry. He is one of the pioneers of the search for intelligent life beyond Earth (SETI). He has also served as a member of the JASON Defense Advisory Group. He is the author of some two hundred scientific articles and reports, has consulted widely for industry and government, and is the designer of numerous scientific and photographic instruments.