January 2006-present Hamad Bin Khalifa Endowed Chair in Islamic Art, Virginia Commonwealth University (Richmond, VA) July 2000-present Norma Jean Calderwood University Professor of Islamic and Asian Art, Boston College (Chestnut Hill, MA), January-March 2005 Frederick Lindley Morgan Visiting Professor of Architectural History, Hite Art Institute, University of Louisville (Louisville, KY) July 2000-June 2001 Visiting Professor of Art History, Smith College (Northampton, MA) Winter 1995-6 Otto-Friedrich-Universität Bamberg (Germany), Visiting Professor of Islamic Art and Architecture Spring 1995 Trinity College (Hartford, CT), Department of Fine Arts, Visiting Associate Professor. Spring 1989 Yale University, Department of the History of Art, Visiting Lecturer 1987-88 Research Associate, Department of Fine Arts, Harvard University 1981-87 Assistant Professor, Department of Fine Arts, Harvard University Spring 1985 Visiting Professor, Centre d’étude du proche-orient ancien, Université de Genève (Switzerland) 1980-81 Aga Khan Lecturer on Islamic Art and Architecture, Harvard University and the Massachusetts Institute of Technology Spring 1980 Visiting Assistant Professor of Art History, University of California, Los Angeles,