He is also a member of the City of Davis Street Tree Commission. McPherson has authored numerous scholarly and technical works on the benefits of urban forests in the West generally, and in California in particular. David Springer a graduate of the University of California, Davis, entered the energy field in 1973 as a designer of solar heating systems and formed Natural Heating Systems, the Sacramento Valley's first specialty solar contracting firm. For two years prior to co-founding DEG, Springer managed projects for the California Energy Commission's Solar Building Program. Specializing in mechanical systems design, he has nationally recognized expertise in hydronic radiant heating, for which he organized and conducted an industry-supported national workshop program.
Springer manages design and energy analysis projects and DEG operations.
Patrick Stoner is the program director for Resource Conservation at the Local Government Commission, a nonprofit organization that helps local elected officials and staff to identify and implement cost-effective, lasting solutions to diverse environmental and social problems. He has been with LGC and in charge of its energy programs since 1993. He has authored and co-authored several books on energy and waste reduction and produced two videos on the same subjects. He has a M.S. in resource development from Michigan State University. Ray Tretheway is the executive director of the Sacramento Tree Foundation.