Two wings:                                                  integrating faith and reason

San Francisco: Ignatius Press, 2018  *  Co-author, with Brian Clayton; forthcoming

 The Problem of Natural Law 

Lanham, Maryland: Lexington Books, 2007

                        Gladly to Learn and Gladly to Teach:                                         Essays on Religion and Political Philosophy                   in Honor of Ernest L. Fortin, A.A.

Lanham, Maryland: Lexington Books, 2002  *  Co-editor, with Michael P. Foley

                                 Nova Doctrina Vetusque:                                                               Essays on Early Christianity                                   in Honor of Fredric W. Schlatter, S.J.  

    New York: Peter Lang, 1999  *  Co-editor, with Catherine Brown Tkacz

                                     Piety and Humanity:                                                Essays on Religion and Early Modern Political Philosophy  

 Lanham, Maryland: Rowman & Littlefield, 1997  *  Editor and Author of Introduction

Augustine: Political Writings  

                              Indianapolis: Hackett Publishing, 1994  *  Co-editor and Co-translator,                                      with Ernest L. Fortin and Michael W. Tkacz