- Prof. Sergei Odintsov (Novosibirsk), Humboldt research fellow, 2002-2003
- Prof. Yaroslav Shramko (Krivoi Rog), Friedrich Wilhelm Bessel awardee, Alexander von Humboldt Foundation, 2004-2005
- Dr Norihiro Kamide (Tokyo), Humboldt research fellow, 2008-2009
- Dr Fabien Schang (Nancy), Clemens Heller fellow, Maison des Sciences de l'Homme and Fritz Thyssen-Stiftung, 2009-2010
- Dr Roberto Ciuni (Leiden), Humboldt research fellow, 2011-2013
- Prof. Roberto Giuntini (Cagliari), Humboldt research fellow, March - May 2012
- Dr hab. Tomasz Skura (Zielona Góra), Humboldt research fellow, July - August 2012
- Prof. Graham Priest (New York, Melbourne), Humboldt reseach awardee, July - December 2013
H.W., Saul Kripke, Norihiro Kamide (2008)