Gordon Leff

• Medieval thought
• William of Ockham
• Bradwardine and the Pelagians
• Gregory of Rimini
• Heresy in the later middle ages
• Heresy, philosophy, and religion in the Medieval West
• History and social theory
• Medieval Thought from Saint Augustine to Ockham
• Medieval thought: St. Augustine to Ockham
• Paris and Oxford universities in the thirteenth and fourteenth centuries
• Richard Fitzralph, commentator of the Sentences
• The dissolution of the medieval outlook