Professor, Institute of Mathematics, Vietnam Academy of Science and Technology (VAST) (Researcher since 1984, Associate Professor 1992, Professor 1996)

Corresponding Member (Korrespondierendes Mitglied) of the Heidelberg Academy of Sciences and Humanities (Heidelberger Akademie der Wissenschaften) (since August 2004)

Corresponding Fellow (Korrespondierendes Mitglied) of the Bavarian Academy of Sciences and Humanities (Bayerische Akademie der Wissenschaften) (since February 2010)

Ambassador Scientist (Vertrauenswissenschaftler) of the Alexander von Humboldt Foundation (Alexander von Humboldt-Stiftung) (March 2010 - February 2013)