Administration:
- Undergraduate Advisor, Department of Linguistics, 2004-2007
- Director, 1998-2002, Program in South Asian and Middle Eastern Studies, Acting Director, 1996-1997, Associate Director 1997-1998
Professional Services:
- Instructor, ?Refresher Course?/Workshop on Language Contact in South Asia, Central Institute of Indian Languages, Mysore, January-February 2011 and Deccan College, Pune, February 2013
- Instructor, ?Refresher Course?/Workshop on Historical Linguistics for linguistic instructors at Indian universities, hosted by the Central Institute of Indian Languages, Mysore, January?February 2009.
- Service to the Societas Linguistica Europaea (Linguistic Society of Europe)
- Member, Publications Committee (2003-2006)
- Editor, Folia Linguistica Historica (2004-2009)
- Member, Executive Committee (2004-2010)
- Member, Editorial Board, Folia Linguistics Historica, 2010-present
- Member, Scientific Committee, 2011 and 2014 Annual Meetings
- Membership in committees of the Linguistic Society of America:
- Committee on Honorary Memberships, 2002-2004 (Chair 2004)
- Abstract Evaluator for the 2007 LSA Annual Meeting
- Undergraduate Program Advisory Committee (2007-2008)
Public Services:
- Trustee, American Institute of Pakistan Studies, 1996-2009; membership on numerous committees, including Fellowships and Nominations
- Trustee, American Institute of Indian Studies, 1996-2002
- Member, Champaign-Urbana International Humanitarian Award Steering and Nominations Committees, 2003-present
- With wife, Zarina, Host family to numerous UIUC students, 1977-present
- Membership in Learned Societies:
- American Oriental Society
- American Association for the Advancement of Science
- Fulbright Society of America (Life Member)
- International Association for Sanskrit Studies
- Linguistic Society of America (Life Member)
- Linguistic Society of India (Life Member)
- Societas Linguistica Europaea