He is the co-author of Improving U.S. Housing Finance through Reform of Fannie Mae and Freddie Mac: Assessing the Options  along with Ingrid Gould Ellen and John Napier Tye. This white paper was completed as part of the What Works Collaborative , a foundation-supported partnership that conducts timely research and analysis to help federal, state and local housing policy-makers frame and implement evidence-based housing and urban policy agendas.
The paper is essential reading as we go through a period of financial reform. The report is described as a timely assessment of alternative proposals for the future of Fannie Mae and Freddie Mac, ranging from nationalization to dissolution. The paper explains the role Fannie and Freddie have played, explores the goals a healthy secondary market for both single- and multifamily housing should serve, and develops a framework to help understand and evaluate the various proposals for reform.