Ezra Haber Glenn, AICP, is Lecturer in the Housing, Community, and Economic Development Group of MIT's Department of Urban Studies and Planning, where he teaches on both community development practice and quantitative methods for planning. He has taught urban planning, politics, and GIS mapping as well at Tufts University and the University of Massachusetts at Lowell. Ezra is also the developer and maintainer of the "acs" package in the R Statistical Language, which helps users download and work with data from the American Community Survey in R.