Professor McGreal was appointed the James L. Koley ’54 Professor of Constitutional Law in July 2025, and has been a Professor of Law since 2015. His teaching, research, and speaking span two fields: constitutional law—particularly religious liberty and the economic analysis of law and religion—and the design and effectiveness of corporate compliance and ethics programs.
In constitutional law, Professor McGreal has published widely on First Amendment doctrine and theory, with recent articles including Reforming the Ministerial Exception in the Villanova Law Review (2024), True Threats and the Neuroscience of Fear in Case Western Reserve Law Review (forthcoming 2025) and Resolving the Ministerial Exception's Economic Paradox in the Florida State University Law Review (forthcoming 2026). One of his current research projects applies economic analysis to claims of clergy malpractice, and another examines the relevance of historical analogies from religious persecution in Reformation Era Europe to current litigation over Ten Commandments displays in public schools.
He is co-author of the leading constitutional law student guide Questions & Answers: Constitutional Law (4th ed., Carolina Academic Press 2023), and the coursebook Skills & Values: The First Amendment (3rd ed., LexisNexis 2021).
On the compliance side, Professor McGreal has written, taught, and spoken on the subject since 1997. During that time, he was a frequent speaker at the Practising Law Institute’s annual Compliance and Ethics Workshop. For over fiften years, he wrote the annual Corporate Compliance Survey for the ABA publication The Business Lawyer, and he published the article Caremark in the Arc of Compliance History in the Temple Law Review. He founded and served as Director of the Corporate Compliance Center at South Texas College of Law (2003–06), where he taught the first course on corporate compliance and ethics programs at a US law school. He is also a founding faculty member of the Texas A&M Mays Executive MBA Program, where he has taught modules on corporate compliance and ethics since 1999.
Professor McGreal’s administrative leadership includes terms as Dean of Creighton University School of Law (2015–17) and Dean of the University of Dayton School of Law (2011–15). He was previously Director of Faculty Development and Interim Associate Dean for Academic Affairs at Southern Illinois University School of Law.
Professor McGreal was a full-time faculty member at South Texas College of Law Houston from 1996 to 2006, and at SIU School of Law from 2006 to 2011. He has also been a visiting professor at George Mason University (spring 2022) and SMU (spring 1996).
Professor McGreal received his LL.M. from Yale Law School (1994) after clerking for the Hon. Warren W. Matthews of the Alaska Supreme Court, and graduated magna cum laude from SMU Dedman School of Law (J.D. 1992), where he served as Editor-in-Chief of the SMU Law Review/Southwestern Law Journal. He holds a B.A. in Economics, cum laude, from Williams College (1989).
Research Focus
One of my current works-in-progress discusses how the Reformation-era practice of \"auslauf\" (or \"going out\") can inform the interpretation of the Religion Clauses of the First Amendment. In mixed religious communities, auslauf typically was an informal practice of religious toleration where dissenters from the legally established religion traveled outside the city to worship, and the local authorities would look the other way. My article argues that practices like auslauf were \"toleration by displacement,\" where the majority faith claims public space and effectively forces dissenters to exit that space to preserve their religious conscience. I argue that the Supreme Court should recognize such practices as one of the hallmarks of a prohibited religious establishment under the First Amendment. An example of such a practice is the recitation of sectarian religious prayers in public schools and at government functions.
Another work-in-progress applies economic analysis to the legal claim of clergy malpractice.
SCOTUS 2024: major decisions and developments of the US Supreme Court McGreal Paul E., NRA v. Vullo [Book Chapter] 2025
First Amendment Law Handbook McGreal Paul, Reforming the ministerial exception [Book Chapter] 2025
Corporate Compliance Practice Guide: The Next Generation of Compliance McGreal Paul E., Cutting edge issues in corporate compliance [Book Chapter] 2009
Courting the Yankees: Legal essays on the Bronx Bombers McGreal Paul E., The Pine Tar Incident [Book Chapter] 2003
Rhodes Charles W, McGreal Paul E, Skills & values 2022
McGreal Paul E, Eads Linda S, Rhodes Charles W, Questions & answers 2017
McGreal Paul E, Eads Linda S, Questions & answers 2007
McGreal Paul E., Eads Linda, Questions & answers 2003
McGreal Paul E, , 3 + 2 = 5 1992
General
Uchimiya Diane, Kelly Michael, McGreal Paul, ICE's relocation of Minnesota detainees echo Korematsu mistakes 2026
McGreal Paul, How Law Schools can champion compliance careers 2026
McGreal Paul, Businesses may have case against city over streetcar 2025
McGreal Paul, So you want to be a compliance professional? Advice for Law Students 2025
McGreal Paul, First US law school course in compliance 2025
McGreal Paul, Judicial power should not be a license to harass 2025
McGreal Paul E., Newsletter (American Bar Association Ad Hoc Committee on Corporate Compliance) 2009
McGreal Paul E., Book review 2009
McGreal Paul E, Staying out of jail 2004
McGreal Paul E., Constitutional illiteracy 1997
Articles
Creighton Lawyer McGreal Paul, Message from the Dean, p. 2 2016
Creighton Lawyer McGreal Paul, Message from the Dean, p. 2 2015
Publications
Michigan law review online McGreal Paul E., Ten Commandments Cases 124, p. 69 - 83 2026
Creighton Legal Insights McGreal Paul, Ten Commandments cases and reformation-era religious persecution 2026
Case Western Reserve law review McGreal Paul E., True threats and the neuroscience of fear 75:3, p. 899 - 927 2025
Villanova Law Review McGreal Paul, Reforming the ministerial exception 69:1, p. 101 - 156 2024
SMU Law Review McGreal Paul E., Tribute to Professor Linda Eads 72:4, p. 553 - 554 2019
Religion & Education Russo Charles J., McGreal Paul E., Religious freedom in American Catholic higher education 39:2, p. 116 - 132 2012
Southern Illinois University Law Journal McGreal Paul E., The making of the Supreme Court's Free Exercise Clause jurisprudence 34:3, p. 469 - 532 2010
The Business Lawyer McGreal Paul E., Corporate compliance survey 64:1, p. 253 - 277 2008
Journal of Legal Medicine McGreal Paul E., 2007-2008 National Health Law Moot Court Competition 29:4, p. 395 - 409 2008
Arizona State Law Journal McGreal Paul E., Social capital in constitutional law 40:2, p. 585 - 649 2008
Southern Illinois University Law Journal McGreal Paul E., The unpublished Free Exercise opinion in Jensen v. Quaring 33:1, p. 1 - 22 2008
University of Pennsylvania Law Review PENNumbra McGreal Paul E., Alfini James J., First Amendment limits on the regulation of judicial campaign speech 157, p. 76 - 99 2008
SMU Law Review McGreal Paul E., Counteracting ambition 60:4, p. 1571 - 1603 2007
University of Pennsylvania Law Review PENNumbra McGreal Paul E., In defense of complete preemption 156, p. 147 - 156 2007
Corporate Counsel Review McGreal Paul E., Best practices in corporate compliance 25:1, p. 29 - 74 2006
Corporate Counsel Review McGreal Paul E., Top ten things corporate counsel should know about the amended organizational sentencing guidelines 24:1, p. 67 - 80 2005
William & Mary Bill of Rights Journal McGreal Paul E., A constitutional defense of legislative history 13:4, p. 1267 - 1299 2005
Houston Lawyer McGreal Paul E., The amended organizational sentencing guidelines 42:5, p. 10 - 19 2005
South Texas Law Review McGreal Paul, Foreword 47:1, p. 1 - 2 2005
Corporate Counsel Review McGreal Paul E., Legal risk assessment after the amended sentencing guidelines 23:2, p. 153 - 199 2004
University of Kansas Law Review McGreal Paul E., Slighting context 52:2, p. 325 - 383 2004
San Diego Law Reivew McGreal Paul E., Why repeal of the death tax means the second demise of substantive due process 39:2, p. 551 - 561 2002
South Texas Law Review McGreal Paul, Foreword 43:3, p. 741 - 742 2002
SMU Law Review McGreal Paul E., Saving Article I from Seminole Tribe 55:2, p. 393 - 426 2002
Notre Dame Law Review McGreal Paul E., Baba DeeDee, Applying Coase to qui tam actions against the states 77:1, p. 87 - 134 2001
Fordham Law Review McGreal Paul E., There is no such thing as textualism 69:6, p. 2393 - 2469 2001
Notre Dame Law Review McGreal Paul E., Unconstitutional politics 76:2, p. 519 - 641 2001
Fordham Law Review McGreal Paul E., Ambition's playground 68:4, p. 1107 - 1198 2000
South Texas Law Review McGreal Paul E., Impeachment as a remedy for ethics violations 41:4, p. 1369 - 1398 2000
William & Mary Bill of Rights Journal McGreal Paul E., The role of suspicion in federal equal protection 8:1, p. 183 - 198 1999
SMU Law Review McGreal Paul E., Kyle Jeffrey D., Conflict of laws 52:3, p. 835 - 857 1999
Alaska Law Review McGreal Paul E., Alaska equal protection 15:2, p. 209 - 280 1998
William & Mary Law Review McGreal Paul E., The flawed economics of the dormant Commerce Clause 39:4, p. 1191 - 1287 1998
South Texas Law Review McGreal Paul E., Equal protection and intersectionality 38:4, p. 1167 - 1173 1997
Case Western Reserve Law Review McGreal Paul E., Some Rice with your Chevron? 45:3, p. 823 - 888 1995
SMU Law Review McGreal Paul E., Conflict of laws 47:4, p. 865 - 890 1994
Texas Bar Journal McGreal Paul E., Are we to be a profession? 56:1, p. 38 - 39 1993
SMU Law Review McGreal Paul E., Conflict of laws 46:4, p. 1123 - 1155 1993
Alaska Law Review McGreal Paul E., A tale of two courts 9:2, p. 305 - 342 1992
Harvard Journal of Law & Public Policy McGreal Paul E., Back to the future 15:2, p. 505 - 620 1992
Library Trends Weissbord David, McGreal Paul, Moral autonomy, censorship, and the enlightened community 39:1-2, p. 51 - 68 1990