American Anthropological Association (AnthroSource Steering Committee, 2003-2006)
American Society for Ethnohistory (Executive Council, 1987-89; 1998-2000; Editorial Board, Ethnohistory, 2007-present)
Association for Computing Machinery (member 1986-present)
French Colonial Historical Society (Conference Organizer, 1988, 1999; Editor, 1989-90; President, 1991-92)
Mississippi Archaeological Association (Secretary-Treasurer, 1983-84, 1992-2000 ; Editor, 1981-2000)
Society of American Archivists (Cochair, Committee on Education and Professional Development, 2005-2008)
Society of Southwest Archivists (member 2002-present)
Southeastern Archaeological Conference (President-Elect, 1993-94; President 1995-96; chair, Native American Liaison Committee, 1996-2000)
Member, Choctaw Heritage Council of Mississippi Band of Choctaw Indians,
Judge, Southern Literary Festival, 1980 (one-act play), 1983 (formal essay).
Computer Panel, National Endowment for the Humanities, 1980s.
Consultant, Multicultural education, Jackson (Mississippi) Public Schools, 1981.
Expert witness, U.S. vs Andrew J. Adams, et al., 1981 (case argued by Mississippi Attorney General's office).
Expert witness, U.S. vs State of Louisiana, Texas, Mississippi, Alabama, and Florida (U.S. Supreme Court, No. 9 original), 1982 (case argued by Mississippi Attorney General's office).
Computer Consultant, Louisiana Association of Museums, 1982.
Historical Advisor, "Nicolas de La Salle: A Tale of Discovery," Exhibit, Mississippi State Historical Museum, March 26-July 18, 1982.
Historical Advisor, "The First Frontier," Auburn Television, 1986-87.
Historical Advisor, "Spirit Warriors," Georgia State University Office of Educational Media, 1987.
Historical Advisor, "Christ: The Living Water," Diocese of Jackson Sesquicentennial Project, 1987.
Core Scholar, "A Question of Image," Auburn Television, 1989-1991.
Expert witness, Choctaw Tribal Court, 1991 (topic historical Choctaw kinship practices).
Historical Advisor, "Historic Indians and French Colonial Period," Permanent Exhibit, Mississippi State Historical Museum, 1990 (preparation) and 1991 (fabrication).
Historical Advisor, "Child of the Sun," radio series, Foundation for New Media, 1991-92.
Historical Advisor, "Putting Hernando de Soto in his Place," Mississippi State Historical Museum Traveling Exhibit, 1992.
Member, Mississippi Automated Resource Information System task force; chair, 1992-93.
American Society for Ethnohistory representative, Wenner-Gren conference on Preservation of the Anthropological Record, 1993.
Historical Advisor, Tunica-Biloxi Indians, 1996.
Historical Advisor and on-camera interviewee, Louisiana History Project, Louisiana Public Broadcasting, 1997-2001.
Historical Advisor, "Cahokia: America's Lost Metropolis," BBC, 1998.
Commissioner, De Soto Expedition Trail Commission, 1992-1996.
Advisory Board, Regional Humanities Center proposal project, Tulane University (NEH-funded planning grant), 1999-2001.
Archival Advisory Board, Methodologies for Preservation and Access of Software-Dependent Electronic Records project, University of California-San Diego Supercomputing Center (NARA/NHPRC-funded grant), 1999-2002.