David Greenberg (PhD, Economics, Massachusetts Institute of Technology) is a labor economist, cost-benefit analyst, and a professor emeritus of economics at the University of Maryland, Baltimore County (UMBC). Much of Dr. Greenberg’s research focuses on the evaluation of government programs. Before coming to UMBC, he worked for the Rand Corporation, SRI International, and the U.S. Department of Health and Human Services. Dr. Greenberg has been a visitor for a year or longer at the University of Wisconsin-Madison; at the Budapest University of Economic Science; and at the Centre for Research in Social Policy at Loughborough University, the Policy Studies Institute at Westminster University, and the Prime Minister’s Strategy Unit, all of which are in England. He is a long-time consultant to MDRC, Abt Associates, and other research organizations. Dr. Greenberg has been published widely on social experimentation, cost and cost-benefit analysis, employment, training programs, evaluation, and other topics. He is co-editor of the Randomized Social Experiments Abstract, which is published weekly by the Social Science Research Network. With his co-authors, he has written five editions of a widely used textbook on cost-benefit analysis, the most recent of which was published in 2018 by the Cambridge University Press. He recently co-edited a special issue of the Evaluation Review, entitled “Do the Estimated Effects of Social Programs Depend on the Source of Data Used to Measure Them? Survey Data versus Administrative Data.” Dr. Greenberg co-authored the chapter “Design of Social Security Administration Demonstration Evaluations” and presented it with Burt Barnow at Lessons from SSA Demonstrations: A State of the Science Meeting.