William J. Bernstein, Ph.D., M.D., is a neurologist and the cofounder of the investment management firm Efficient Frontier Advisors. He is the author of three finance books--The Intelligent Asset Allocator, The Four Pillars of Investing, and The Investor's Manifesto--and two volumes of economic history, The Birth of Plenty and A Splendid Exchange. Bernstein is currently working on a history book exploring the effects of access to technology on human relations and politics.
