Mark Zandi is chief economist and cofounder of Moody's Economy.com, where he directs the company's research and consulting activities. Moody's Economy.com, a division of Moody's Analytics, provides economic research and consulting services to businesses, governments and other institutions.

A geopolitical strategist and forecaster, Mr Zeihan combines topography, economics, demographics, history and culture to craft the future. He approaches the world from his clients' points of view, distilling global complexities into actionable items, leaving audiences with clear concepts of what cannot happen, what must happen eventually, and what will happen very soon.

Professor Siegel has written and lectured extensively about the economy and financial markets, has appeared frequently on CNN, CNBC, NPR and others networks.