Mark H. Obrinsky, Ph.D., is Senior Vice President for Research and Chief Economist. with principal responsibility for housing and economic research.  Mark was formerly Director of Regulatory Policy at Fannie Mae. Previous positions at Fannie Mae included Director of Applied Portfolio Research and Senior Economist.  Prior to joining Fannie Mae, Mark was Deputy Director of the Economics Department at the U.S. League of Savings Institutions. His academic experience includes seven years teaching Economics at the University of Delaware and Bradley  University.  His work on housing, mortgage finance, and economic theory has appeared in leading professional and industry publications. Mark holds a Bachelor of Arts degree (with honors) in Mathematics from the University of Wisconsin and a Ph.D. in Economics from the University of Pennsylvania.