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- Academic Fellow, Philosophy Department, University of South Carolina, 2016–
- Guest Researcher, Max-Planck-Institut für Wissenschaftsgeschichte, Berlin, July, September, November 2015, May 2016, May 2017
- Research Group: Max Dehn, Mathematisches Forschungsinstitut Oberwolfach, November 2015
- Visiting Scholar, Université Paris Diderot, March/April, 2015
- Visiting Scholar, Mittag–Leffler Institute, Djursholm, Sweden, February 1991, January 2015
- Guest Researcher, Laboratoire d’Histoire des Sciences et de Philosophie, Archives Henri Poincaré, Université de Lorraine, February 2010; March 2014
- Visiting Professor, Oklahoma University, 2005-2006. Distinguished Karcher Lecturer, October 2014
- Senior Fellow, Dibner Institute for History of Science and Technology, Massachusetts Institute of Technology, 1996, 2000-2001
- Research Grant, Deutsche Forschungsgemeinschaft, 2000-2002
- National Science Foundation Grants, History & Philosophy of Science and Mathematics Divisions, 1983–84, 1988, 1989–1990
- Fellow, Alexander von Humboldt Foundation, Göttingen, 1983-1985, 1989
- Wilhelm Ostwald Gastprofessor, Leipzig University, August 1989