Lectures
(Picture: Marcel at Sciences Po, Lille, 2016)
Het utopisme van de redelijkheid, Stichting Grasveld, Wageningen, 1990.
Politiek en ethiek: het treurige lot van de politicus, Apeldoornse vereniging van politieke jongerenorganisaties, Apeldoorn, 1993.
On social justice and political science, staff seminar, Nijmegen 1991.
The Archpoint, Polybios Research School, Leiden, 1994.
Green Liberalism, IRNES, First European Seminar, ESRC, London, 24 april 1996.
Groenen in Europa, speech, national conference of De Groenen (Dutch Green party), Nijmegen, March 1998. Published in De Groene Nijmegenaar, 1998/5.
De representatie van dieren in groene politieke theorie, guest lecture, Philosophical Institute, University of Groningen, 9-12-1998.
Democracy and Fuzzy Politics, brief lecture in a masterclass on Democracy over the borders of the state, Nijmegen School of Management, 19 April 2001.
Virtue, economics and green liberalism, ECPR Summer school in green politics and policy, Keele University, Staffordshire, UK, 7-9-2001
Sustainable food production and anthropocentrism, Stichting DuVo, Wageningen University, 14-9-2001
Rawls on social justice, University of Leiden, 12 October 2001.
Integriteit en Bureaucratie (Integrity and bureaucracy), lecture at the Annual BOW Conference, Belvoir Hotel, Nijmegen, 16 April 2002.
Rawls' liberalism, University of Leiden, 25 October 2002.
Doodsangst (The Fear of Death), student union lecture on the occasion of the start of the 2003 National Book Week, Diogenes, Nijmegen, 11 March 2003.
Drie benaderingen van het milieu in de politieke filosofie, Symposion in honour of prof. Dr. G.A. van der Wal, Erasmus University Rotterdam, the Netherlands, 23-1-2004.
Plastic bomen en de intrinsieke waarde van de natuur, Humanistisch Verbond Wageningen, Wageningen, 7 June 2005.
Leiderschapstrijd in de VVD, 'Hot' current affairs lecture for students in political science, Radboud University, 17 May 2006.
Liberalisme en milieu (Liberalism and environment), Summer school of the Telders Foundation (scientific bureau of the Dutch liberal party VVD), Leusden, 28 August 2006.
Milieu en natuur: kiezen of delen? (Environment and nature: pick or share), lecture, symposium on international environmental policy from a liberal perspective, Telders Foundation, The Hague, 16-2-2007.
Geloof, Waarheid en Wetenschap (Faith, Truth and Science), lecture, federation of protestant and catholic churches, Wageningen, 19-2-2007.
Klimaatverandering en politieke verantwoordelijkheid (Climate change and political responsibility), lecture, Filosofisch café, Stichting Filosofie en Maatschappij, Trianon, Nijmegen, 6-3-2007.
Grenzen aan Zorg (The limits of care), lecture, Humanistisch Café, Humanistisch Verbond Nijmegen, 23-4-2007.
Milieu, markt en moraal (Environment, market and morality), lecture, Landelijke JOVD (Liberal youth organization), Utrecht, 25-5-2007.
Liberalisme en milieu (Liberalism and environment), Summer school of the Telders Foundation, Leusden, 28-8-2007.
Liberalisme, duurzaamheid en een korreltje zout (Liberalism, sustainability and a grain of salt), lecture at the political philosophy weekend of the JOVD (Liberal youth organization), The Hague, 20-10-2007.
International Relations and the Culture of Peace, United Netherlands & Soeterbeeck, Radboud University Nijmegen, 19-11-2007.
Liberalisme en ecologisme, presentation of my research 1992-2007 at the Convenantsdag Vragen uit de milieufilosofie (Questions in environmental philosophy), joint meeting of departments of philosophy, Catholic University Leuven and Radboud University, Leuven, 17 December 2007.
Liberalisme en milieu (Liberalism and environment), Summer school of the Telders Foundation, Leusden, 27-7-2008.
Als een vader en een herder, Lecture on the populist agenda in current Dutch politics, Philosophical Café, Nijmegen, 5 May 2009. Available online...
Plastic Bomen (Plastic Trees), lecture on the intrinsic value of nature, five years after my inauguration, KIVI NIRIA (Royal Institute of Engineers), Utrecht, 13 May 2009.
Waarden in gebiedsontwikkeling: ecologisme, Kennisatelier Hogeschool Windesheim, Zwolle, 9 April 2010.
Vrijheid en eerlijkheid, closing lecture Philosophy Month (Maand van de Filosofie), Radboud University Nijmegen, 28 April 2010.
Liberalism, Libertarianism and the Environment, ECPR Summer School, Keele (UK), 12-23 July 2010.
Property and liberal versus libertarian environmentalism, same.
Liberalisme en milieu, Summer school of the Telders Foundation, Doorn, 26 August 2009.
Waarom sociaaldemocraten slecht voor de natuur zijn, (Why social democrats are bad for nature) lecture for the opening of the political year, national conference of the Jonge Socialisten, youth organization of the Labour Party, Nijmegen, 4 September 2010.
Environmentalism: A transatlantic perspective, Keynote address for The Obama Effect: Transatlantic Perspectives Past and Future, Middelburg, 27-30 October 2010. Available online...
Commentaar op Onbeholpen Burgerschap, reply to Evelien Tonken’s keynote address, Burgerschapslezing, Forum voor Democratische Ontwikkeling in cooperation with Soeterbeeck Programme, The Hague, 3 March 2011. Available online...
Is er een Liberale Ethiek?, Philosophical weekend of the Young Liberals JOVD, The Hague, 19 March 2011
Duurzaamheid in geuren en kleuren, lecture for the regional political youth organizations, Nijmegen, 23 March 2011
Gen-Ethische Dilemma’s, national conference of the Young Liberals JOVD, Almelo, 16 April 2011
1-1-4, lecture on animal politics and recent developments in political theory, back-to-school meeting of Radboud alumni in political science, Utrecht, 21 May 2011.
Een Teleologie van het Sociaal Contract, lecture for a staff seminar, IKV Pax Christi, Utrecht, 23 May 2011. Available online...
Liberalisme en Milieu, nationale kaderdag JOVD, The Hague, September 2011
Het sociaal contract en de echte wereld, lecture and debate at a staff seminar, IKV Pax Christi, Utrecht, 1 November 2011.
Media: can’t live with them, can’t shoot them and bury them in the back yard, PiP congress, Nijmegen, 18 November 2011.
Eerlijk duurt het langst, Lecture and debate (with dr. R. Pierik) on Theories of Justice, organized by the young staff of the Scientific Bureaus of political parties GroenLinks, WBS (PvdA) and Telders Foundation (VVD), The Hague, 17 March 2012.
Liberalisme en milieu, Summer school of the Telders Foundation (scientific bureau of the Dutch liberal party VVD), Breukelen, August 2012.
Lazarus, op! Waarom zelfredzaamheid een politiek ideaal is, Nascholingsdag SGBO (Society of Company Physicians), Nijmegen, 18 September 2012.
Kiezen, Keynote Address, national work conference Royal Dutch Society of Archivists, Amsterdam, 11 June 2013.
The concept of nature, ECPR Summer School on Environmental Politics, Keele, 27 June 2013.
Animals: welfare or rights? Lecture and seminar, Food Politics in Europe, Summer school of Utrecht University, University College Middelburg, 8 July 2013.
Religie als LARP: Blasfemiewetgeving en geloofsprivileges (Religion as LARP: Laws on blasphemy and religious privileges), Openluchtfestival van de Rede (Festival of Reason), Deventer, 7 September 2013. Available online...
Justice and Youth Quotas: Comments from a Libertarian Perspective, Keynote address, “Youth Quotas – The Answer to Changes in Age Demographics?”, Stuttgart, 26 October 2013. Available online...
The Ethics of Creating Knowledge for Society, PhD Day, Nijmegen School of Management, 5 November 2013.
Aristoteles’ Politica, Academy for Liberal Arts, Naarden, 4-3-2014.
From Environmental to Ecological Sustainability, guest lecture in 'Economics and Sustainable Development', Erasmus course, Bachelor programme in Economics, RU Nijmegen, 11-3-2014.
Are Human Rights Animal Rights?, keynote, General Conference of the International Association of Political Science Students IAPSS, Nijmegen, 22 October 2014.
Ecologisme (Ecologism), Masterclass on political ideologies, SGP Youth Organization (protestant party youth organization), Rotterdam, 13 January 2015.
Liberalen, Verantwoordelijkheid en Integriteit (Liberals, Responsibility and Integrity), JOVD Rijk van Nijmegen (liberal party youth organization), Nijmegen, 10 February 2015.
Tolerantie vanuit humanistisch en atheïstisch perspectief (A humanist and atheist perspective on tolerance), Stichting Veritas, Nijmegen, 3 March 2015.
Ongelijkheid is niet het probleem, Maand van de Filosofie (Inequality is not the problem; National Philosophy Month), Veghel, 22 April 2015.
Linkse indoctrinatie aan mijn universiteit (lecture on the website ‘Left wing indoctrination at my university’), Bestuurlijk Overleg Studentenverenigingen Nijmegen Carolus Magnus, Nijmegen, 16 October 2015.
Freedom in the Anthropocene, Lecture for the XXI Lustrum of KSV Franciscus, Wageningen University, 1 March 2016.
Green Liberalism, JOVD Leiden, June 2016.
Animal ethics, Lecture and seminar, Summer school on Food Politics Utrecht University, University College Middelburg, July 2016.
Het populisme voorbij!? (Beyond Populism!?), GroenLinks Rheden, Velp, 8 March 2017.
The Dish of the Day, brief lecture, International Towel Day, Brebl, Nijmegen, 25 May 2017.
Rights and Politics for Nonhumans, Guest lecture in Politics, Ethics and Practice, Radboud University, Nijmegen, 29 May 2017.
Liberalisme en milieu, Summer school of the Telders Foundation, Driebergen, 31 August 2017.
Brexitannia, a discussion of the movie Brexitannia, InScience Film Festival, Lux, Nijmegen, 10 November 2017.
Environmentalism, animals and liberalism, presentation of research agenda, Nijmegen, 22 November 2017.
Epistocracy, technocracy, and the Anthropocene discourse, Leiden University, 7 September 2018.
Dierwaardigheid en wetenschap: over recht en redelijkheid, inauguration prof. dr. F. Swennen as professor of 'Dier en Recht' (Animal and Right), University of Antwerpen, 18 October 2018.
Embryoselectie bij ernstige erfelijke aandoeningen, on embryo selection, Van Lodenstein College, Amersfoort, 1 November 2018: See https://www.youtube.com/watch?v=jE7cXVzlu8Q
Dierproeven verbieden?, on animal testing, Trivium debating society and Dwars (political youth organization), Nijmegen, 11 December 2018.
Liberalisme, on liberalism (the basics), Arnnimma Academy, Young Socialists Arnhem-Nijmegen, Arnhem, 23 April 2019.
Liberalisme, neoliberalisme en de markt, Conference De Zichtbare Hand, Utrecht, 29 August 2019.
Toekomstige generaties: Recht op een groene toekomst?, Lecture for Radboud Reflects, Nijmegen, 20 January 2020. See https://www.youtube.com/watch?v=ooFuiKQm43c&t=47s