A Director with Navigant Consulting, Todd Williams has over twenty-five years of domestic and international energy market experience, He has expertise across a broad range of disciplines and hands-on energy efficiency, demand response and energy services experience in both regulated and unregulated energy markets, including electricity and natural gas energy efficiency program and portfolio design, implementation and evaluation for electricity and natural gas. Mr. Williams has served as an expert witness on energy efficiency and has conducted numerous energy efficiency potential studies, market analyses, end-use studies and evaluations covering the industrial, commercial and residential sector.