Editorial Boards.
- Bulletin of the American Mathematical Society, Associate Editor of Book Reviews.
- Communications in Number Theory and Physics.
- Integers.
- International Journal of Modern Mathematics.
- The International Journal of Number Theory.
- The International Mathematical Forum.
- Involve.
- Journal of Combinatorics and Number Theory.
- Online Journal of Analytic Combinatorics.
- Proceedings of the American Mathematical Society (Managing Editor 2010-2014)
- The Ramanujan Journal.
Advisory Boards.
- Banff International Research Station (BIRS), Advisory Board (2009-2011).
- Institute for Mathematics and Education, Advisory Board, Tucson, Arizona.
- AMS Mathematical Research Communities Advisory Board (2010-2013).
- Associate Member, Pohang Mathematics Institute,POSTECH, South Korea.
- U.S. National Committee for Mathematics (2010-present), NAS.
- SASTRA Ramanujan Prize Committee (2010-2011).