Direction of international meetings

  • "Partial Differential Equations". 25.04. - 29.04.1988, Holzhau. Head of the section: "Spectral Theory for Schrödinger Operators".
  • "Operator Calculus and Spectral Theory". 08.12. - 14.12.1991, Lambrecht (Pfalz). financed by the Deutsche Forschungsgemeinschaft. conference management together with B.-W. Schulze (Potsdam).
  • "Partial Differential Equations." 06.09. - 12.09.1992, Potsdam. conference chair together with B.-W. Schulze (Potsdam).
  • "Mathematical Results in Quantum Mechanics". 17.05. - 22.05.1993, Blossin (near Berlin). financed by the DFG. conference management with P. Exner , H. Neidhardt , V. Zagrebnov .
  • "Partial Differential Equations". 06.09. - 10.09.1993, Potsdam. conference chair together with B.-W. Schulze(Potdam).
  • "Partial Differential Equations". 03.07. - 09.07.1994, Holzhau. conference chair together with B.-W. Schulze (Potsdam).
  • "Functional Analysis in Quantum Physics". 10.07. - 12.07.1994, Clausthal.
  • "Schrödinger Operators". 09.07. - 15.07.1995, Mathematisches Forschungsinstitut Oberwohlfach. conference chair together with V. Enß (Aachen).
  • "Applied Analysis". 17.07. - 19.07.1995, Clausthal. conference chair together with M. Plum (Clausthal).
  • "Partial Differential Equations". 24.07. - 28.07.1995, Caputh. Conference chair together with B.-W. Schulze (Potsdam).
  • German-Israeli Workshop: "Partial Differential Equations and Mathematical Physics". 04.12. - 09.12.1995, Jerusalem. Conference chair together with M. Ben-Artzi (Jerusalem) and B.-W. Schulze (Potsdam).
  • "Mathematical Results in Quantum Mechanics". 23.06. - 28.06.1996, Ascona (Switzerland). conference chair together with W. O. Amrein (Geneva) and J. M. Graf (Zurich).
  • "Partial Differential Equations". 29.07. - 03.08.1996, Potsdam (Germany). conference chair together with B.-W. Schulze (Potsdam).
  • Workshop: "Functional Analysis in Quantum Physics". 16.06. - 20.06.1997, Clausthal. Conference leader together with J. Hilgert (Clausthal) and D. Mayer (Clausthal).
  • "Spectral Theory and Stochastic Analysis". 26.07. - 01.08.1998, Mathematisches Forschungsinstitut Oberwolfach. conference chair together with M. van den Berg (Bristol) and J. van Casteren (Antwerp).
  • German-Israeli Workshop: "Spectral and Scattering Theory". 10.05. - 14.05.1999, Jerusalem. Head of the German delegation. Conference chair together with M. Ben-Artzi (Jerusalem).
  • "Partial Differential Equations, PDE 2000: Schrödinger Operators." 07/24 - 07/28/2000, Clausthal. Funded by the DFG, the state of Lower Saxony and the mountain town of Clausthal-Zellerfeld.
  • German-Chinese-Workshop: "Partial Differential Equations in Geometry and Physics" Clausthal, 2006. Funded by DFG and NSFC (National Science Foundation of China). Conference chair together with Ch. Hua (Wuhan), B.-W. Schulze (Potsdam) and J. Song (Beijing).
  • Chinese-German Workshop: "Partial Differential Equations and Applications in Geometry and Physics". Xi'an, 2007. Funded by DFG and NSFC (National Science Foundation of China). Conference chair together with Changzheng Q. (Xi'an), Hua Ch. (Wuhan), B.-W. Schulze (Potsdam) and Song J. (Beijing).
  • "Partial Differential Equations and Spectral Theory." Goslar, 2008. funded by Deutsche Forschungsgemeinschaft, Land Niedersachsen, Sparkasse Goslar/Harz, TU Clausthal. conference chair together with B.-W. Schulze (Potsdam), I. Witt (Göttingen).
  • Workshop: "A Spectral Day in Clausthal." Clausthal, 2012.
  • "Operator & Spectral theory, Operator algebras, Non-commutative Geometry & Probability." International Conference. Kozhikode, Kerala (India), 2014.
  • Workshop:"Mathematical physics and partial differential equations". Clausthal, (September) 2014.