Mimeo 2001 ÌÇÐÄvlog¹ÙÍø Authors See citation below for complete author information. David Ellwood Isabelle and Scott Black Professor of Political Economy, Emeritus Christopher Jencks Malcolm Wiener Professor of Social Policy, Emeritus Citation Ellwood, David, and Christopher Jencks. "The Growing Differences in Family Structure: What Do We Know?" Mimeo, 2001.