Leo Rainer is an engineer in the Building Technology and Urban Systems Division of the Energy Technologies Area at Lawrence Berkeley National Laboratory. He has more than 30 years of experience in building energy efficiency including work on building simulation, monitoring, miscellaneous energy use, and building codes and standards. Mr. Rainer is currently responsible for the development and maintenance of the Home Energy Saver website. Mr. Rainer earned his B.S. in Mechanical Engineering from the University of California at Davis in 1981.