"Legal Positivism as a Realist Theory of Law," Keynote, Workshop on “Legal Realism and Legal Positivism” as part of the 29th World Congress of the International Association for the Philosophy of Law and Social Philosophy (IVR), University of Lucerne, Switzerland, July 2019; Keynote ("Headliner") Address, Legal Theory Symposium, Faculty of Law, National University of Singapore, March 2019; Legal Philosophy Forum, Faculty of Laws, University College London, December 2018; Conference on "Fundamentals of Legal Positivism: Main Tenets, Normativity and Values," University of Stockholm, Sweden, November 2018

“Bernard Williams’ Debt to Nietzsche: Real or Illusory?” Keynote, Conference on “Agency, Fate, and Luck: Why Williams Matters,” University of Lund, Sweden, June 2019

“Nietzsche, Spinoza, Freedom.” Workshop on “Modern Naturalisms: Spinoza, Hume, Nietzsche,” Department of Philosophy, Boston University, MA, April 2019

"The Roles of Judges in Democracies: A Realistic View," Legal Theory Workshop, Faculty of Law, National University of Singapore, March 2019; Centre for Law & Philosophy, University of Surrey, UK, March 2018

“The Death of God and the Death of Morality,” Birkbeck Nietzsche Workshop, University of London, December 2018; Workshop on Law, Philosophy, & Political Theory, Law School, Department of Philosophy, and Department of Political Science, University of California, Berkeley, February 2016; Department of Philosophy, Northern Illinois University, DeKalb, December 2015; Department of Philosophy, Georgia State University, Atlanta, November 2015; Post-Kantian Seminar, Faculty of Philosophy, Oxford University, UK, October 2015; Conference in Honor of Maudemarie Clark, Department of Philosophy, Colgate University, Hamilton, NY, September 2015

"Academic Freedom: What is it and what is it good for?" Harper Lecture, University of Chicago Alumni Association, Boston, MA, October 2018

"Justifying Academic Freedom: Mill and Marcuse Revisited," Law School, University of California, Los Angeles, September 2018; College of Law, University of Utah, Salt Lake City, November 2017; Brooklyn Law School, New York, September 2017

"Disagreement, Anti-Realism about Reasons, and Inference to the Best Explanation," Conference on "Moral Disagreements: Philosophical and Practical Implications," Australian Catholic University Melbourne-Rome Campus, Rome, Italy, September 2018

"Nietzsche's Naturalism," Keynote for the 8th Annual Summer School on Classical German Philosophy, University of Bonn, Germany, July 2018

"The Innocence of Becoming: Nietzsche Against Guilt," 3rd Annual Meeting of the International Society of Nietzsche Studies, Birbeck College, University of London, UK, March 2018

"Workshop on four chapters of Moral Psychology with Nietzsche, Department of Philosophy, University of California, San Diego, December 2017

"Academic Freedom and the Obligations of Administrators," Center for Law and Liberty, Law School, Columbia University, New York, NY, November 2017

"On the Relevance of Etiology to Justification," Department of Philosophy, University of Colorado, Boulder, November 2017

"What is academic freedom?" Public panel discussion sponsored by the Center for Western Civilization, University of Colorado, Boulder, November 2017

"Langdell, Wissenschaft, Realism," Panel on "Langdell and Legal Formalism" as part of the Harvard Law School Bicentennial, Law School, Harvard University, Cambridge, Mass., October 2017

"Toleration and Respect," a public dialogue with philosopher Anna Elisabetta Galeotti, Department of Philosophy, University of Turin, Italy, October 2017

"Realism and Moralism in Political Thought," Keynote address in connection with the Bozze Prize in Ontology and the conference on "Post-Truth, New Realism, Democracy," University of Turin, Italy, October 2017

"Faculty Speech and the Obligations of Administrators," Panel discussion on academic freedom, School of Law, Northwestern University, Chicago, IL, October 2017

Keynote to the Philosophy of Law Section, Swedish Congress of Philosophy, Uppsala University, Sweden, August 2017

Workshop on “Evidence, Disagreement, and Rights,” Department of Philosophy, Uppsala University, Sweden, August 2017

“Freedom and Free Will in Nietzsche,” Keynote for 7th Annual Summer School on Classical German Philosophy, this one on "Freedom and Free Will," University of Bonn Germany, July 2017

College of Law, University of Iowa, Cedar Rapids, April 2017

Various talks in philosophy and/or law at universities in Israel, March 2017

Conference on “A Naturalistic Jurispruence: the Next Step?” Osgoode Hall School of Law, York University, Toronto, November 2016

Keynote at conference on “The Role of Judges in a Democracy,” plus talks/seminars to the Faculties of Law, Political Science, & Philosophy, University of Belgrade, Serbia, October 2016

Conference on the History of Relativism, Department of Philosophy, University of Vienna, September 2016

Summer School on “The Hermeneutics of Suspicion,” University of Bonn, Germany, June 2016 (keynote)

“The Epistemology of the Hermeneutics of Suspicion.” Keynote Address, Summer School on “The Hermeneutics of Suspicion,” Institute for Philosophy, University of Bonn, Germany, June 2016

“Theoretical Disagreements in Law: Another Look,” Joint KCL/NUS/Chicago Conference on Moral, Political & Legal Philosophy, University of Chicago, IL, May 2016; Keynote Address, Conference on “Deep Disagreements: Philosophical and Legal Perspectives,” Humboldt University, Berlin, June 2015

“The Case Against Free Speech,” School of Law, Willamette University, Salem, OR, April 2016

“Religious Liberty and Religious Toleration,” Faculty of Philosophy, University of Cantanzaro, Italy, March 2016

“The Methodology of Legal Philosophy,” Faculty of Law, University of Cantanzaro, Italy, March 2016

Comments on Emden’s Nietzsche’s Naturalism. North American Nietzsche Society, Annual Meeting of the Eastern Division of the American Philosophical Association, Washington, DC, January 2016

“The Public Perception of Legal Education,” College of Law, Georgia State University, Atlanta, November 2015

“The Innocence of Becoming,” Nietzsche Workshop, Department of Philosophy, Birkbeck College, University of London, U.K., October 2015; Department of Philosophy, University of Geneva, Switzerland, October 2015; Victoria University, Department of Philosophy, August 2013; Moral Psychology and Responsibility: Empirical and Non-Empirical Perspectives Conference at University of Antwerp Centre for Law and Cosmopolitan Values, June 2013

“Why Legal Positivism?” Department of Legal Theory, Jagellonian University, Krakow, Poland, October 2015

“Marx: Ideology, Morality, Science,” Department of Philosophy, University of Vienna, Austria, October 2015

“Nietzsche: Naturalism, Perspectivism, Asceticism,” Department of Philosophy, University of Vienna, Austria, October 2015

Conference on “Deep Disagreements in Philosophy and Law,” Humboldt University (sponsored by the Volkswagon Foundation), Berlin, June 2015 (keynote)

“Why Tolerate Religion?” Public Lecture, Drury University, Springfield, MO, April 2016 (also sponsored by the philosophy departments at Evangel University and Missouri State University); Department of Philosophy and College of Law, Georgia State University, Atlanta, November 2015 (also sponsored by the Emory University Center for Law & Religion);Secular Student Alliance, Northern Illinois University, DeKalb, December 2015; Georgia State University School of Law; Emory University Center for Law and Religion, March 2015; Veritas Forum, Northwestern University, Chicago, IL, September 2014; Pacific Division of the American Philosophical Association Annual Meeting, April 2014; Center for Inquiry, October 2013; Center for Inquiry, April 2013; Carnegie Council, December 2012; Nassau Community College Department of Philosophy, December 2012; University College Dublin Department of Philosophy, November 2012; Faculty of Law at King Carlos III University, March 2012; Faculty of Law at Bocconi University, October 2011; Queen’s University School of Law, October 2011; Law and Religion Rountable at Northwestern University School of Law, June 2011 (discussion); Florence G. Kline Colloqium at University of Missouri, April 2007; Department of Philosophy at Colgate University, March 2007; University of Minnesota Minneapolis-St. Paul Law School, March 2007; Virginia Polytechnic Institute & State University, November 2006 (keynote address); Chicago-Kent College of Law, November 2006; University of Chicago Law School Faculty Workshop, October 2006; ‘Or ‘Emet Lecture at Osgoode Hall Law School, March 2006

“The Truth is Terrible,” Department of Philosophy, Pomona College, Claremont, CA, February 2015; University of Toronto Department of Philosophy, March 2014; Hansford M. Epes Distinguished Lecture in the Humanities at Davidson College, November 2013; Washington University-St. Louis Department of Philosophy, September 2013; University College Dublin Department of Philosophy, November 2012; Nietzsche on Morality and the Affirmation of Life Conference at St. Peter’s College at Oxford University, November 2012; Conference on Nietzsche and Community at Wake Forest University, April 2012

University of California-Riverside Department of Philosophy, February 2015

“Normativity for Naturalists,” Department of Philosophy, University of California, Riverside, February 2015; Department of Philosophy, University of Miami, January 2015

“The Case Against Free Speech,” School of Law, University of Miami, Florida, January 2015

“Constitutional Law, Moral Judgment, and the Supreme Court as Super-Legislature.” Mathew O. Trobiner Memorial Lecture on Constitutional Law, Hastings College of Law, University of California, San Francisco, January 2015

"The Paradoxes of Public Philosophy," keynote address at conference on “Philosophy in the Public Sphere,” OP Jindal Global University, November 2014

“The Case Against Free Speech,” Human Rights Program at University of Palermo, October 2014; Julius Stone Address at University of Sydney Law School, August 2013

“Why Legal Positivism?,” European University Institute, October 2014; Australian Society of Legal Philosophy Annual Meeting, August 2013 (keynote address); Symposium on Legal Positivism: For and Against at Annual Meeting of the Association of American Law Schools Section on Jurisprudence, January 2010

"Legal Positivism and the Methodology of Legal Philosophy,” Fresco Lectures, Faculty of Law, University of Genoa, Italy, October 2014

Conference on Toleration, New York University-Abu Dhabi, September 2014

“Marx, Law, Ideology, Legal Positivism,” Conference on Jurisprudence and History at University of Virginia-Charlottesville Law School, September 2014; Central Division of the American Philosophical Association Section on Law & Philosophy Annual Meeting, February 2014

"Does religion deserve special legal protection?," Veritas Forum at Northwestern University, September 2014

“Resolve: Repeal the Religious Freedom Restoration Act, Yale Political Union, Yale University, New Haven, CT, September 2014

“On the Esoteric Reading of Nietzsche,” Conference on Nietzsche, Value and Self-Constitution at Oxford University, May 2014

“Reply to Critics,” “Author Meets Critics” session on Why Tolerate Religion? (Princeton, 2013), Annual Meeting, Pacific Division of the American Philosophical Association, San Diego, CA, April 2014

“Nietzsche against the Philosophical Canon,” University of California-Riverside Department of Philosophy, February 2014; Annual Meeting of the Danish Philosophical Association, March 2013 (keynote address)“Is Religion Special? Toleration, Conscience, and Exemptions from the Law,”

“Is Religion Special? Toleration, Conscience, and Exemptions from the Law,” Isaac Backus American Freedoms Lecture, La Sierra University, Riverside, CA, February 2014; University of Illinois-Chicago College of Medicine, January 2014; Pepperdine University School of Law, October 2013; Dan and Gwen Taylor Lecture, Department of Philosophy, University of Otago, Dunedin, New Zealand, August 2013

“Toleration: Its Nature and Moral Justification,” Keynote address at conference on “The Spectacle of Toleration,” Newport Historical Society & others, Newport, Rhode Island, October 2013 (keynote)

Commentary on Lawrence Sager, Conference on the Role of Religious Institutions in a Democracy, Center for Church-State Studies at DePaul University Center for Law, September 2013

“Nietzsche Against the Philosophical Canon,” University of Missouri Department of Philosophy, September 2013

“Nietzsche’s Naturalism Reconsidered,” Nietzsche’s Naturalism Reconsidered Conference at Institute for Advanced Study, 2013 (organized by Helmut Heit)

“The Methodology of Legal Philosophy," Florida State University College of Law, April 2013; Federal University of Rio de Janeiro, March 2013; Law & Philosophy Workshop at University of Pennsylvania, December 2012

“Legal Realisms, Old and New,” Pontifical Catholic University of Rio de Janeiro, March 2013; Seegers Lecture in Jurisprudence at Valparaiso University Law School, November 2012; New Frontiers of Legal Realism Conference at University of Copenhagen, May 2012

"In Praise of Realism,” Universidad Torcuato Di Tella, March 2013; University of Miami School of Law and Department of Philosophy, February 2010; Arizona State University, College of Law, October 2009; School of Law, University of San Diego, CA, April 2010; 1st Annual Distinguished Lecture in Jurisprudence at Legal Philosophy Club of Northwestern University School of Law, February 2009; University of Wisconsin-Madison Law School, December 2008; University of Tulsa College of Law, August 2008; Dunbar Lecture on Law and Philosophy at University of Mississippi, March 2008

“Moralities are a Sign-Language of the Affects,” Annual Meeting of the Central Division of the American Philosophical Association, February 2013; Conference on New Essays in Moral Philosophy at Social Philosophy & Policy Center and Arizona Freedom Center, January 2013; Project on Nietzsche and the Self at New University of Lisbon, March 2012; Bernd Magnus Lecture at University of California-Riverside, March 2012

“Moral Skepticism and Moral Disagreement in Nietzsche,” Practical Philosophy Workshop at Northwestern University, October 2012; Boston University Workshop on Late Modern Philosophy, October 2012; 9th Annual Metaethics Workshop at University of Wisconsin-Madison, September 2012; Georgetown University, April 2012; Moral Sciences Club at Cambridge University, October 2011; Queen’s University, October 2011; City University of New York Graduate Center, February 2011; Western Michigan University, December 2009; McMaster University, December 2009; 5th Annual Conference on Issues in the History of Modern Philosophy at New York University, November 2008

“The Demarcation Problem in Jurisprudence,” Law & Philosophy Workshop at Georgetown University, April 2012; Legal Philosophy Conference at McMaster University, May 2011 (keynote address); Conference on Jurisprudence and Value-Neutrality at University of Girona, May 2010

“The Boundaries of the Moral (and Legal) Community,” Meador Lecture at University of Alabama School of Law, September 2011

“The Law of Religious Liberty in a Tolerant Society,” Pennsylvania State University Dickinson School of Law, August 2011; Summer Workshop on Law, Religion & Culture, Law School at University of Colorado-Boulder, July 2011 (keynote address); Leon Green ’15 Lecture in Jurisprudence at University of Texas-Austin School of Law, March 2011; Fordham University School of Law, February 2011

Conference on Metaethics and Legal Judgment at Institute for Law and Philosophy of University of Illinois-Urbana-Champaign, March 2011

“The Circumstances of Civility,” Civility and American Democracy Conference at Washington State University, March 2011

Why Tolerate Religion? Chapters 1-3, Cornell University Law School, October 2010; Legal Theory Workshop at Columbia University, October 2010

“The Radicalism of Legal Positivism,” Mary Olive Woods Lecture at Western Illinois University, September 2010

“Legal Formalism and Legal Realism: What is the Issue?,” University of California-Irvine School of Law, September 2010

“Foundations of Religious Liberty: Toleration or Respect?,” Conference on “Freedom of Conscience.” Institute for Law and Philosophy, University of San Diego, CA, April 2010; Analytic Legal Philosophy Conference at New York University School of Law April 2010; Society for Applied Philosophy Annual Meeting, December 2009; Conference on Respect, Global Justice, and Human Rights at Institute for Advanced Study, November 2009; Law & Philosophy Workshop at University of Michigan Law School, October 2009; MacMillan Center Initiative on Religion, Politics & Society at Yale University, March 2009

“Rorty and the Philosophical Tradition: A Comment on Professor Szubka,” Annual Meeting of the Central Division of the American Philosophical Association, February 2010

“Explaining Theoretical Disagreement.” Institute for Philosophical Investigations at National Autonomous University of Mexico, November 2007; University of California-Los Angeles Law School, October 2007; Faculty of Law and Program in Social and Political Theory at Australian National University, August 2007

“Naturalizing Jurisprudence: Three Approaches,” Conference on The Future of Naturalism at State University of New York at Buffalo, September 2007

“Nietzsche’s Theory of the Will,” Colgate University, March 2007; University of Minnesota Minneapolis-St. Paul, March 2007; Georgia State University, January 2007; Washington University-St. Louis, March 2006; University of Manchester, November 2005; Moral Sciences Club at Cambridge University, October 2005; Conference on Nietzsche and Naturalism at Harvard University, November 2004; Conference on Nietzsche and Ethics at Annual Meeting of the Friedrich Nietzsche Society of Great Britain, September 2004 (plenary address)

“Why Evolutionary Biology is (so far) Irrelevant to Law,” Institute for Law and Philosophy at University of Pennsylvania Law School, February 2007; Florida State University College of Law, September 2005; University of Southern California Law School, February 2004; George Mason University Law School, October 2003; Law & Economics Workshop at University of Illinois Urbana-Champaign College of Law, September 2003

“Indeterminacy in the Law and the Ethical Obligations of Judges in Hard Cases,” Continuing Legal Education Seminar at Gardere Wynne Sewell LLP, July 2006

“The Case for Nietzschean Moral Psychology,” Committee on Law and Philosophy at Arizona State University, February 2006; University of Newcastle upon Tyne, December 2005

“Philosophy of Law: The Current State of Play,” Centre for Philosophy of Natural and Social Science and Faculty of Law at London School of Economics, December 2005

“Beyond the Hart/Dworkin Debate,” University of Reading, December 2005; Cambridge University, November 2002; University of Paris I (Panthéon-Sorbonne), March 2002; Legal Philosophy Colloqium at Oxford University, March 2002

“Toleration and Religion,” Gardner/Honoré Seminar on Political Philosophy at Oxford University, December 2005

“Does Naturalized Jurisprudence Change the Subject?,” Conference on The Challenge of Philosophical Naturalism at Rutgers University School of Law, June 2005

Conference on, The Conditions for a Pragmatic Approach to the Norm: Reflections on the Recent Pragmatist Turn in Legal Philosophy at University of Louvain, June 2005 (participant and discussant)

“Explaining Theoretical Disagreement,” Joseph Raz’s Legal Philosophy Seminar at Columbia University Law School, October 2009

“Who is the ‘Sovereign Individual’? Nietzsche on Freedom,” Annual Meeting of the Friedrich Nietzsche Society at St. Peter’s College at Oxford University, September 2009 (keynote address)

Big Ten Aspiring Legal Scholars Conference at University of Illinois-Urbana-Champaign School of Law, August 2009

“Cleaning Cyber-Cesspools: Google and Free Speech,” New York Law School, February 2009; Conference on Speech, Privacy, and the Internet at University of Chicago Law School, November 2008

“The Epistemic Authority of the Human Sciences: Critical Reflections on Foucault,” How Do We Keep Knowing? Symposium at Glasscock Center for Humanities Research, October 2008 (keynote address)

“Nietzsche’s Naturalism Reconsidered," Conference on Nietzsche, Naturalism, and Normativity at University of Southampton, July 2008

“Explaining Theoretical Disagreement,” University of Girona, June 2008; Fresco Lectures at University of Genoa, March 2008

"Science and Methodology in Legal Theory,” University of Girona, June 2008

“Gemes on Perspectivism,” Conference on Skepticism: Ancient, Modern, and Contemporary at New York University in Florence, June 2008

“American Legal Realism,” Fresco Lectures at University of Genoa, March 2008; Villanova University School of Law, October 2002

“Science and Methodology in Legal Theory.” Institute for Philosophical Investigations, National Autonomous University of Mexico, Mexico City, November 2007.

“The End of Empire: Dworkin and Jurisprudence in the 21st Century,” Institute for Comparative Jurisprudence at Loyola University Los Angeles Law School, December 2004; Inaugural Conference of the Institute for Law & Philosophy at Rutgers University School of Law, May 2004 (keynote address)

"The Hermeneutics of Suspicion: Recovering Marx, Nietzsche, and Freud,” Cardozo Law School, October 2004

“The Hermeneutics of Suspicion: The Case of Freud,” Texas A&M University, March 2004

“The Hermeneutics of Suspicion,” Philosophical Society at Oxford University, May 2003; Birkbeck College, October 2002

“The Methodology Problem in Jurisprudence,” University College, May 2003

“Nietzsche as Naturalist: For and Against,” Intercollegiate seminars at University of London, May 2003 (with Sebastian Gardner)

“Beyond the Hart/Dworkin Debate: The Methodology Problem in Jurisprudence,” Conference on Law’s Moral Foundations: Has It Any? at University of Notre Dame, April 2003

“Why Texas Can’t Afford Textbook Censorship,” Rotary Club of Houston, February 2003

“Nietzsche’s Genealogy of Morality,” Intercollegiate seminars at University of London, November 2002

“Textbook Censorship in Texas," American Constitution Society at University of Texas-Austin School of Law, September 2002

"Asceticism and Perspectivism," Conference on Nietzsche on Truth at University of London, October 2001

"Naturalism in Legal Philosophy," Workshop on Naturalism and Realism in Legal Philosophy at Columbia University, April 2001

"What is 'Genealogy' and What is Nietzsche's Genealogy?," University of Pennsylvania, March 2001

"Naturalized Epistemology and the Law of Evidence," Symposium on New Perspectives on Evidence at University of Virginia School of Law, February 2001

"The Naturalistic Turn in Legal Philosophy," Jurisprudence Section of the Association of American Law Schools, January 2001

"Educational Quality Ranking of U.S. Law Schools," National Association of Pre-Law Advisors Annual Meeting, November 2000

"Charles Alan Wright: Legal Realist," A Tribute to Charles Alan Wright at University of Texas-Austin School of Law, November 2000

"Legal Realism and Legal Positivism Reconsidered," University of Pennsylvania Law School, October 2000; Northwestern University School of Law, April 1999; Legal Theory Workshop at University of Chicago Law School, January 1999; Yale Law School, October 1998; Boalt Hall School of Law at University of California-Berkeley, March 1998; University of Virginia School of Law, January 1998

"Legal Realism, Hard Positivism, and the Limits of Conceptual Analysis," Conference on Reason and Rationality in the Common Law at Worcester College of Oxford University, July 2000

"Moral Facts and Best Explanations," Conference on Moral Epistemology, Social Philosophy & Policy Center at Bowling Green State University, June 2000

"Holmes, Nietzsche, and Classical Realism," Legal Theory Workshop at University of Toronto, November 1999; A Centennial Symposium on Oliver Wendell Holmes, Jr.'s Intellectual Legacy at University of Iowa College of Law, January 1997

"Social Epistemology and the Law of Evidence," Conference on Epistemology and the Law of Evidence at 3rd Annual Law & Philosophy Workshop at University of North Carolina-Chapel Hill, October 1999

"Measuring the Academic Distinction of Law Faculties," Conference on Citation Studies at Northwestern University School of Law, April 1999

“Hart, Legal Realism, and Empirical Rule-Skepticism,” Special Session on Philosophy of Law at XXth World Congress of Philosophy, August 1998

"Nietzsche's Metaethics," Rice University, April 1998

"Objectivity, Morality, and Adjudication," 2nd Annual Conference on Analytic Legal Philosophy at Columbia University School of Law, April 1997

"Why Quine Is Not a Postmodernist," Symposium on Dennis Patterson's Law and Truth (Oxford, 1996) at Southern Methodist University School of Law, December 1996

"Nietzsche: Three Themes," Symposium on Five Perspectives on Nietzsche at University of Texas-Austin, April 1996

"Rethinking Legal Realism," University of Iowa College of Law, November 1995

"Nietzsche and the Morality Critics," University of Texas-Austin, November 1995; Rutgers University, September 1995

"The Philosophy of Judging," Florida Conference of District Court of Appeals Judges Annual Education Meeting, September 1995

"Legal Realism," Oxford-USC Legal Theory Institute at Brasenose College of Oxford University, July 1995

"Realism and Positivism Reconsidered," University of Texas-Austin, March 1995

"Heidegger and the Theory of Adjudication," Law & Interpretation Section of the Association of American Law Schools Annual Meeting, January 1995

"Morality in the Pejorative Sense," University of Arizona, April 1994

"Legal Indeterminacy and the Legitimacy of Adjudication," University of Arizona College of Law, April 1994

"Pornography, Causation and Harm," Rutgers University School of Law, January 1994

"Pornography and Equality," Fourth Biennial Discussion Group on Constitutional Law, December 1993

"Morality in the Pejorative Sense," University of California-San Diego, October 1993; Tulane University, February 1993

"The Jurisprudence of Neorealism," University of San Diego School of Law, January 1993

"Legal Realism and Varieties of Legal Indeterminacy," Rutgers University School of Law, January 1993

"American Legal Realism and Naturalized Jurisprudence," University of Pennsylvania Law School, January 1993.