Bill Witherell joined Cumberland Advisors as Chief Global Economist in November 2005. He also is a Senior Consultant for Finance and Corporate Governance to the Organization for Economic Cooperation and Development (OECD). Dr. Witherell is the Chairman of the International Roundtable of the National Association for Business Economics, a member of the Boston Economic Club and the Westborough Rotary. From 1989 through September 2005 he was OECD's Director for Financial and Enterprise Affairs.

Dr. Witherell is a graduate of Colby College and holds an M.A. and a Ph.D. in Economics from Princeton University. He began his career as a business economist with Exxon and Esso Eastern (1967-73), where he held positions in the economics, treasury and corporate planning functions. He moved to the international economic and financial policy field in 1973 with positions first in the U.S. Department of State and then in the Department of the Treasury (1974-77) as Director of the Office of Financial Resources and Energy Finance. He joined the Secretariat of the OECD in Paris, France, in 1977. Dr. Witherell currently resides in North Grafton, MA.