Society for Economic Botany (SEB)
- President, 2006-2007
- Secretary, 2002-2005
- Council Member-at-large, 1998-2001
- Member 1990-present
Pacific-Asia Biodiversity Transect Network (PABITRA)
- Workshop co-organizer (2000, 2003)
- Organizational development (1998-2005)
International Society for Ethnopharmacology (ISE)
- Founding member (1990, Strasbourg, France)
International Society of Ethnobiology (ISE/ICE)