Ludger Woessmann is Professor of Economics at the University of Munich and Director of the Ifo Center for the Economics of Education and Innovation. Hanushek and Woessmann are coauthors (with Paul E. Peterson) of Endangering Prosperity: A Global View of the American School.

Paul E. Peterson is Henry Lee Shattuck Professor of Government and Director of the Program on Education Policy and Governance at Harvard University. He is the author or editor of many books, including Schools and the Equal Opportunity Problem, coedited with Ludger Woessmann (MIT Press, 2007).