2007 
 February 26-March 2, 2007
Magdeburg/Hannover  Visit Thorsten Holm and Wolfgang Willems.
 August 20-24, 2007:
Torun, Poland  
XII International Conference on Representations of Algebras  
talk: Morita invariance of bilinear forms on modules over group rings.
 September 24-28, 2007:
Lens  Geometric aspects in ring and representation theory.
 October 15-25; October 28-29, 2007:
Beijing Normal University Visit Changchang Xi; 6 hour lecture series
 October 26-28, 2007:
Nanjing Normal University Visit Jiaqun Wei; 2 hour lecture series
 November 6-8, 2007: 
Hanover/Magdeburg Visit Wolfgang Willems and Thorsten Holm.
 November 9-10, 2007:
Magdeburg  Norddeutsches Gruppentheorie Kolloquium. 
 und Professor Hupperts 80. Geburtstag  
 2008: 
 February 7, 2008: 
Paris Séminaire Chevalley, exposé : 'Invariance dérivée des idéaux de Külshammer et généralisations de Hochschild';
 April 14-18, 2008: 
Hanover/Magdeburg Visit Wolfgang Willems.
talk: 'Gerstenhabers Lie Klammer als Coderivation'
 June 19-25, 2008: Representation theory of Algebras: CIMPA-UNESCO-Iran
 
International conference at the IPM in Teheran/Iran.
talk: 'Derived Invariance of Külshammer's Ideals'
 September 9, 2008: Köln Visit Guodong Zhou and Yuming Liu.
 
 September 25-27, 2008: Interactions between representation theory and commutative algebra Institut de Matematica (IUMB), Barcelona, Spain. 
 October 31, 2008: Bielefeld ADE-chains workshop.
 
 November 24-27, 2008: Magdeburg Visit Wolfgang Willems.
 
 December 1-5, 2008: Homology of algebra: structures and applications CIRM Luminy