Roger Messenger is professor emeritus of electrical engineering at Florida Atlantic University in Boca Raton, FL. He received his Ph.D. in electrical engineering from the University of Minnesota and is a Registered Professional Engineer, a Certified Electrical Contractor, and a NABCEP Certified PV Installer, who enjoys working on a field installation as much as he enjoys teaching a class or working on the design of a system or contemplating the theory of operation of a system. His research work has ranged from electrical noise in gas discharge tubes to deep impurities in silicon to energy conservation. He worked on the development and promulgation of the original Code for Energy Efficiency in Building Construction in Florida and has conducted extensive field studies of energy consumption and conservation in buildings and swimming pools. Since his retirement from Florida Atlantic University in 2005, he has worked as vice president for engineering at VB Engineering, Inc., in Boca Raton. The VB Engineering team has completed several hundred PV designs to date, including the design of the 5808-module, 4-acre, 1 MW system on the roof of the Orange County Convention Center in Orlando, Florida. He has also been active in the Florida Solar Energy Industries Association and the Florida Alliance for Renewable Energy, has served as a peer reviewer for the U.S. Department of Energy, and has sat on the Florida Solar Energy Center Policy Advisory Board. He has conducted numerous seminars on designing, installing, and inspecting PV systems.