Jason Zweig is an investing and personal finance columnist for The Wall Street Journal. Previously, he was a senior writer at Money magazine, mutual-funds editor at Forbes magazine, and a guest columnist for Time and cnn.com. He is the editor of the revised edition of Benjamin Graham's "The Intelligent Investor," the classic text that Warren Buffett has called "by far the best book about investing ever written." Zweig serves on the editorial boards of Financial History magazine and The Journal of Behavioral Finance. Visit the author at www.jasonzweig.com.