Urban Affairs Forum | By George Galster, Distinguished Professor of Urban Studies and Planning, Wayne State University. First in a series sponsored by Urban Affairs Review, Galster's essay summarizes the empirical evidence on segregation, geographic inequalities, and opportunity, including research by Inequality & Social Policy affiliates Edward Glaeser, David Hureau (Ph.D. '16), Nathaniel Hendren, Christopher Jencks, Lawrence Katz, Ann Owens (Ph.D. '12), Robert J. Sampson, and Patrick Sharkey (Ph.D. '07).