Edmund S. Phelps, professor of political economy at Columbia University, discusses the causes of the economic slump in the United States.

ANDREW ROSS SORKIN: Good afternoon, everybody. My name is Andrew Ross Sorkin with The New York Times and CNBC. I am pleased to introduce today Edmund Phelps -- Professor Edmund Phelps, I should say,…

Watch Nobel Laureate in economics, A. Michael Spence, analyze the many policy measures addressing the global crisis.

LS: I didn't share many of the policy preferences of that administration, I found the experience to be one that was very interesting. I think from that point forward I hoped I would have a chance to …

Watch Lawrence H. Summers, Harvard University's Charles W. Eliot university professor, reflect on his career in government and academia as part of CFR's HBO History Makers Series.