PETER SCOTT CURTISS is a consulting engineer in Boulder, Colorado. He received his Ph.D. in Civil Engineering at the University of Colorado, where he was one of the first to investigate the use of neural networks in the control and optimization of large HVAC systems.NEWTON BRETH has worked as an Instrument Technician at the University of Colorado since 1977. Prior to that, he spent time in the U.S. Army Signal Corps and the Denver Water Board. He is certified by the Instrument Society of America and holds several U.S. patents related to automatic control devices.