"Margaret M. Blair is a senior fellow in Economic Studies at the Brookings Institution and author of Ownership and Control: Rethinking Corporate Governance for the Twenty-first Century (Brookings, 1995). Mark J. Roe , professor of business regulation and director of the Sloan Project on Corporate Governance at Columbia Law School, is the author of Strong Managers, Weak Owners: The Political Roots of American Corporate Finance (Princeton, 1996)."