During the energy crisis of the 1970s, he led the development of General Electric’s pioneering energy-efficient lamp. In 1976, he invented the first compact, but due to the difficulty of the manufacturing process for coating the interior of the spiral glass tube, GE did not manufacture or sell the device. Other companies began manufacturing and selling the device in 1995. The Smithsonian Institution houses Hammer's original CFL prototype.
Awards & Recognition: Hammer is an IEEE Fellow and the 2002 IEEE Edison Medal winner.