Hospitalists in Encyclopedia of Health Services Research, Ross M. Mullner, Editor. SAGE Publications, 2009, Vol. 1, pp 331-333.
(with Lorens Helmchen)

Economies of Scale in Encyclopedia of Health Services Research, Ross M. Mullner, Editor. SAGE Publications, 2009, Vol. 1, pp 614-618.
(with Tanguy Brachet)

Theories of Firm Behavior in the Non-Profit Sector: A Synthesis and Empirical Evaluation in The Governance of Not-for-Profit Firms, Edward L. Glaeser, Editor, NBER 2003, pp 181–216. 
(with Anup Malani and Tomas Philipson)
[Link to PDF]

Barriers to Entering Medical Specialties in preparation for the Encyclopedia of Health Economics
(with Sean Nicholson and Henry Bergquist)

Distinctive Features of Home Health Markets in preparation for the Encyclopedia of Health Economics
(with Dan Polsky)