After studying philosophy as an undergraduate in Australia, Neil Lewis did his PhD degree at Pittsburgh in the United States, developing an interest in medieval philosophy. His research has focused on Robert Grosseteste and early thirteenth-century English philosophy. He is a core member of the Ordered University Project devoted to interdisciplinary study of Grosseteste's scientific works, and also of the Richard Rufus of Cornwall Project, which is devoted to the preparation of critical editions of the works of Richard Rufus of Cornwall. Most of his academic career has been spent as a professor in the philosophy department at Georgetown University in Washington D.C.

• AcknowledgementsSigla and AbbreviationsIntroductionDe libero arbitrio, earlier recensionDe libero arbitrio, later recensionAppendix: Richard Rufus of Cornwall on the Problem of a Plurality of Eternal BeingsIndex Sacrae ScripturaeIndex Auctorum Operumque AntiquorumIndex of Modern Works and AuthorsIndex DoctrinalisIndex to the Introduction

After studying philosophy as an undergraduate in Australia, Neil Lewis did his PhD degree at Pittsburgh in the United States, developing an interest in medieval philosophy. His research has focused on Robert Grosseteste and early thirteenth-century English philosophy. He is a core member of the Ordered University Project devoted to interdisciplinary study of Grosseteste's scientific works, and also of the Richard Rufus of Cornwall Project, which is devoted to the preparation of critical editions of the works of Richard Rufus of Cornwall. Most of his academic career has been spent as a professor in the philosophy department at Georgetown University in Washington D.C.

• AcknowledgementsSigla and AbbreviationsIntroductionDe libero arbitrio, earlier recensionDe libero arbitrio, later recensionAppendix: Richard Rufus of Cornwall on the Problem of a Plurality of Eternal BeingsIndex Sacrae ScripturaeIndex Auctorum Operumque AntiquorumIndex of Modern Works and AuthorsIndex DoctrinalisIndex to the Introduction