William J. Bernstein is author of the book, The Birth of Plenty: How the Prosperity of the Modern World was Created. William is a financial theorist and historian whose books include Masters of the Word, The Four Pillars of Investing and A Splendid Exchange. He is a Ph.D., M.D. and is a practicing neurologist in Oregon. Known for his quarterly journal of asset allocation and portfolio theory “Efficient Frontier,” Dr. Bernstein is also a principal in the money management firm Efficient Frontier Advisor. He is a frequent guest columnist for Morningstar, and is often quoted in The Wall Street Journal. He lives in Portland, Oregon.