NATIONAL / INTERNATIONAL
PROFESSIONAL SOCIETIES AND SERVICE
President, Texas Medieval Association, 2007-08.
On-Line Panelist for NEH Summer Stipends Program, 2006-.
Equestrian Order of the Holy Sepulchre of Jerusalem [honorific order, bestowed by Vatican City]: Knight Commander, 2008-; Knight, 2003-08.
Chairperson, Board of Advisors, H-Catholic Discussion Network, H-Net List, 2004-06; member of the Board of Advisors, 1999-2006.
Advisor for the Texas Tech University 2002 Vatican Exhibition, 1999-2002.
Member, Editorial Board, `Medieval Religion and Culture,' a series now published by Routledge, formerly by Cassell/Continuum and The University of Leicester Press, 1998-.
Section Director for Normandy, Sources Hagiographiques de la Gaule, project of the German Insitute in Paris, directed by Martin Heinzelmann, 1995-.
Reader and Examination Contributor, Advanced Placement European History Exam, Educational Testing Service, 1995-.
Chair, John Gilmary Shea Book Prize Committee of the American Catholic Historical Association, 1996; member, 1994-96.
Member, Hagiography Society, 1988-.
Life Member, American Historical Association, 1985-.
Member, American Association of University Professors, 1984-.
Member, Charles Homer Haskins Society, 1982-.
Member, Catholic Historical Association, 1982-.
Life Member, Medieval Academy of America, 1979-.