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- On Franco-German Relations in Mathematics, 1870-1920, Invited Section Lecture, International Congress of Mathematicians, Rio de Janeiro, August 2018.
- Wartime Memories of Gaston Darboux in Göttingen, Darboux Centenary Conference, Institut Henri Poincaré, November 2017.
- Otto Blumenthal und seine Bedeutung für die Göttinger Mathematik, Workshop zum Mathematiker-Nachlass-Archiv, Universität Göttingen, July 2017.
- The Role of Configurations in Classical Algebraic Geometry, Mathematics Colloquium, Simon Fraser University, March 2017.
- Educating the Eyes: Geometrical Models and their Makers, 1860-1890, Whipple Museum, Cambridge University, November 2016.
- On Enriques’ Work and Times: Perspectives from Germany, Convegno in memoria di Federigo Enriques, Accademia dei Lincei, October 2016.
- Two Guest Lectures: On Einstein’s Rise to Fame; On the Rise and Fall of Mathematische Annalen, 1869-1928, Centre François Viète, Université de Nantes, September 2016.
- On Paradoxes in Spacetime Models: Machian and anti-Machian Cosmologies from Einstein to Gödel, Philosophy Colloquium, University of South Carolina, February 2016; Physics Colloquium, University of Arkansas, March 2016.
- Mach’s Principle and Relativistic Cosmology, 1917-1924, Oberwolfach Workshop, History of Mathematics: Models and Visualization in the Mathematical and Physical Sciences, December 2015.
- From Einstein to Schücking: Mach’s Principle and Relativistic Cosmology, The Renaissance of General Relativity in History: Assessing Einstein’s Legacy in Post-World War II Physics, Max Planck Institut für Wissenschaftsgeschichte, Berlin, December 2015.
- Geschichtliches zu Einsteins Theorie: 100 Jahre Allgemeine Relativitätstheorie, Deutsches Museum, München, November 2015.
- Einstein und die Anfänge der relativistischen Kosmologie, 1917 bis 1924, “Meilensteine der Mathematik”, Mathematische Gesellschaft Hamburg, June 2015.
- Max Dehn: his Long Journey to Black Mountain College, Black Mountain College Conference, Asheville, North Carolina, September 2015.
- Reflections on the Role of Construction in Hilbert’s Grundlagen der Geometrie, Philomath Seminar, Paris VII Diderot, June 2015.
- Beltrami, Klein, and Poincaré: Reflections on their Roles in the History of Non-Euclidean Geometry, Workshop on History of Non-Euclidean Geometry, Institut Henri Poincaré, May 2015.
- Four Guest Lectures: On Visualizing Quartic Surfaces in the 1860s; Historiography of Ancient Mathematical Sciences: Otto Neugebauer and the Göttingen Tradition 1920-1950; On the Early Works of Klein and Lie, 1869-1872; On Editing Mathematische Annalen, 1872-1928, SPHERE, Paris VII Diderot, March-April 2015.
- Three Karcher Lectures: Visualizing Exotic Objects: Famous Models from the 19th Century; Models of Quartic Surfaces as seen by Kummer, Plücker, and Klein; Who was Jakob Steiner and what was his Roman Surface?, Oklahoma University, October 2014.
- On Visualizing Quartic Surfaces in the 1860s, SPHERE, Paris VII Diderot, March 2014.
- On Segre’s Contributions to the Theory of Quadratic Line Complexes, International Conference “Homage to Corrado Segre”, Turin Aacademy of Science, November 2013.
- Transforming Tradition: Richard Courant in Göttingen and New York, Symposium at the Opening of the Traveling Exhibition, “Transcending Tradition: Jewish Mathematicians in German-Speaking Academic Culture”, New York University, October 2013.
- A Strained Partnership: Klein, Lie, and European Mathematics, 1870-1900, Agder University College, Kristiansand, Norway, September 2013.
- Reassessing the influence of German mathematics on research in the United States, 1876-1914, 24th International Congress of History of Science, Technology and Medicine, Manchester, July 2013.
- Mathematical Models as Artefacts for Research: Felix Klein and the Case of Kummer Surfaces, Oberwolfach Workshop, From Mixed to Applied Mathematics: Tracing an important dimension of mathematics and its history, March 2013.