Mr. Breeden criticized the make-up of the committee , a bipartisan collection of academics and business leaders including R. Glenn Hubbard , dean of the Columbia Business School and a former chairman of the Council of Economic Advisers under President Bush ; Kenneth Griffin , founder and chief executive of Citadel Investment Group , a $ 13 billion hedge fund , and John L. Thornton , chairman of the Brookings Institution and a former co-president of Goldman Sachs .