Several visits took him to the Vietnam Institute for Advanced Study in Mathematics (VIASM) (2010, 2017), to the Korea Institute for Advanced Study (KIAS) and to the National Taiwan University at Taipei (2009, 2013, 2016).
Mehrere Besuche führten ihn zum Vietnam Institute for Advanced Study in Mathematics (VIASM) (2010, 2017), zum Korea Institute for Advanced Study (KIAS) und zur National Taiwan University in Taipei (2009, 2013, 2016).