Before joining PHB, Dr. Hall served as a commissioner at the Federal Energy Regulatory Commission; senior staff advisor at the Office of Energy Policy and Planning, Executive Office of the President; deputy assistant secretary of defense; economic advisor at the Atomic Energy Commission; and economist at the Board of Governors of the Federal Reserve System. He was also a senior economist at the RAND Corporation and an assistant professor of economics at the University of Virginia. He has written extensively on government regulation, antitrust policy and energy issues.

Dr. Hall received a B.A. in business administration from Claremont McKenna College and an M.A. and a Ph.D. in economics from Harvard University.