David Smick keeps a low profile, but experts consider him one of the most insightful financial market strategists in the world. For more than two decades, he has conferred with central bankers (such as Alan Greenspan and Ben Bernanke) and advised top Wall Street executives and investors, from George Soros to Michael Steinhardt to Stan Druckenmiller. Political leaders (from Bill Bradley to Jack Kemp) have regularly sought his policy advice.

The World Is Curved picks up where Thomas Friedman's The World Is Flat left off, taking readers on an insider's tour through the private...