"Revolution and War:  Marxist Theories and Spanish Realities," Ohio Academy of History (Spring 1982).

"The Struggle Between the Crown and Nobility in Medieval Iberia II," 32th International Congress on Medieval Studies, Western Michigan University, Kalamazoo, Michigan (May 1997).

"The Crusades in Spain," 34th International Congress on Medieval Studies, Western Michigan University, Kalamazoo, Michigan (May 1999).

"Infamous but Dead Medievalists," 36th International Congress on Medieval Studies, Western Michigan University, Kalamazoo, Michigan (May 2001).

"Late Medieval Town Institutions in Peace and War," 38th International Congress on Medieval Studies, Western Michigan University, Kalamazoo, Michigan (May 2003).

"Fables and  Storytelling in the Libro de buen amor," 39th International Congress on Medieval Studies, Western Michigan University, Kalamazoo, Michigan (May 2004).

Session 301:  "Reconquest and Holy War," 39th International Congress on Medieval Studies, Western Michigan University, Kalamazoo, Michigan (May 2004).

(with Gillian Ahlgren, Xavier University), "Sainthood in Reformation Europe," Sixteenth Century Studies Conference, Toronto, Canada (October 1998).

"The Fragility of Historical Memory," the Ohio Academy of History, Union Terminal Museum Center, Cincinnati, Ohio (April 2002).