- Fellow of the American Academy of Arts & Sciences, 2012
- Member of the American Law Institute, 2008 -
- Maurice R. Greenberg Visiting Professor of Law, Yale Law School, fall 2009
- Visiting Scholar, American Enterprise Institute, 2007-
- International Research Fellow, Oxford Centre for Business Taxation, 2006-
- Board of Trustees, National Tax Association, 2012-
- Trustee, American Institute of Tax Policy, July 2003-2009
- Richard Musgrave Prize, 2004
- Consultant, President’s Advisory Panel on Federal Tax Reform
- Academic Advisory Panel, Joint Committee on Taxation Simplification Study
