| 07.07.08-12.07.08 | Conference 'Modules and representation theory', Babes-Bolyai University Cluj-Napoca |
| 17.02.08-23.02.08 | Tagung 'Representation theory of finite dimensional algebras', Mathematisches Forschungsinstitut Oberwolfach |
| 26.10.07 | 10th NWDR Workshop, Düsseldorf |
| Lecture 'm-cluster tilted algebras of type A' | |
| 21.10.07-25.10.07 | CIRM-Conference 'Calabi-Yau algebras and N-Koszul algebras', Marseille-Luminy | Lecture 'Calabi-Yau dimensions of stable module categories' |
| 24.09.07-29.09.07 | Workshop 'Geometric aspects in ring and representation theory', Lens |
| Lecture 'Calabi-Yau dimensions of stable module categories' (28.09.07) | |
| 02.09.07-07.09.07 | BIRS-Workshop 'Hochschild Cohomology of Algebras: Structure and Applications', Banff International Research Station (BIRS) | Lecture 'Bilinear forms, Hochschild (co-)homology and invariants of derived module categories' |
| 15.08.07-24.08.07 | ICRA XII, International Conference on Representations of Algebras, Torun |
| Lecture 'Cluster categories and selfinjective algebras' (20.08.07) | |
| 13.07.07-14.07.07 | Darstellungstheorietage 2007, Leibniz Universität Hannover |
| 18.06.07-22.06.07 | Research stay, Universität Bielefeld (Sonderforschungsbereich 701) |
| 22.06.07 | Universität Bielefeld, Seminar Representation Theory of Algebras |
| Lecture 'Cluster categories and selfinjective algebras' | |
| 15.04.07-20.04.07 | Research stay, University of Newcastle |
| 22.02.07-23.02.07 | Workshop 'Support Varieties in Representation Theory', Paderborn |
| 25.01.07 | Universität Osnabrück |
| Lecture 'Cluster-Kategorien und selbstinjektive Algebren' |
| 15.12.06-16.12.06 | Workshop on Representation Theory, Hannover |
| Lecture 'Cluster categories and selfinjective algebras' | |
| 16.11.06-18.11.06 | Kolloquium über Kombinatorik (KolKom 2006), Magdeburg |
| 10.11.06-11.11.06 | Representations of algebras and their geometry (Conference in Honour of Helmut Lenzing), Paderborn |
| 25.09.06-29.09.06 | CIRM Luminy, Conference 'Homologie et déformations en algèbre, géometrie et représentations', Marseille | Lecture 'Bilinear forms, Hochschild homology and invariants of derived module categories' |
| September 2006 | Professeur Invité, Université Montpellier 2 (one month) |
| 14.09.06 | Université Montpellier 2, Séminaire AGATA |
| Lecture 'Maximal orthogonal modules for selfinjective algebras and generalized cluster complexes' | |
| 13.08.06-19.08.06 | Workshop on Triangulated Categories, Leeds (Satellite Conference of the ICM 2006) |
| Co-organizer (with P. Jørgensen and R. Rouquier) | |
| 06.08.06-10.08.06 | Research stay, University of Oxford |
| 19.07.06 | Universität Hannover, Oberseminar zur Algebra und Algebraischen Kombinatorik |
| Lecture 'Maximal orthogonale Moduln, Cluster-Komplexe und Catalan-Zahlen' | |
| 18.07.06 | Universität Köln, Algebra Research Seminar |
| Lecture 'Maximal n-orthogonal modules for selfinjective algebras' | |
| 07.07.06-09.07.06 | Workshop 'Perspectives in Representation Theory', Bad Honnef |
| 16.06.06 | Universität Bielefeld, Representation Theory Seminar |
| Lecture 'Maximal n-orthogonal modules for selfinjective algebras' | |
| 25.05.06-27.05.06 | Workshop on Cluster Algebras and Cluster Tilted Algebras, Bielefeld |
| 12.03.06-25.03.06 | Research in Pairs (RiP), Mathematisches Forschungsinstitut Oberwolfach (with K. Erdmann) |
| 17.02.06 | 7th NWDR-Workshop, Hannover | Lecture 'Cartan matrices and graded derived invariants for gentle quivers' |
| 06.02.06 | Hannover Algebra Seminar |
| Lecture 'Generalized Reynolds ideals and derived equivalence classifications' | |
| February 2006 | Research stay, University of Hannover |
| 23.01.06-28.01.06 | Conference on representation theory and related topics, International Center for Theoretical Physics (ICTP), Trieste, Italy |
| Lecture 'Weighted locally gentle quivers and Cartan matrices' |
| 10.10.05 | Leeds Algebra Seminar |
| Lecture 'Cartan matrices, gentle quivers and beyond' | |
| 04.09.05-10.09.05 | Oberwolfach-Workshop 'Cohomology of Finite Groups: Interactions and Applications' |
| 04.07.05-22.07.05 | Research stay, University of Hannover |
| 01.07.05 | 5th NWDR-Workshop, Bielefeld |
| 27.06.05 | Magdeburg, Seminar on Discrete Mathematics and Geometry |
| Lecture 'Zählen von Wegen in Graphen mit Relationen und Invarianten von Algebren' | |
| 16.06.05-19.06.05 | Joint International Meeting AMS-DMV-ÖMG, Mainz |
| Lecture 'On the representation dimension of rank 2 group algebras and related algebras' | |
| 26.05.05-31.05.05 | Workshop Algebras and Representation Theory ,Warwick |
| Lecture 'Representation dimension of algebras' | |
| 13.05.05-14.05.05 | 5th ARTIN Meeting (Algebra and Representation Theory In the North), York |
| 14.04.05 | Paderborn Representation Theory Seminar |
| Lecture 'Cartan determinants for gentle algebras' | |
| 03.04.05-15.04.05 | Research stay, University of Hannover |
| 09.03.05 | Glasgow Algebra Seminar |
| Lecture 'Algebras, representations and explicit invariants' | |
| 22.02.05 | Manchester Algebra Seminar |
| Lecture 'Algebras, representations and explicit invariants' | |
| 12.02.05 | Meeting Group Theory and its Applications, Manchester |
| 04.02.05-05.02.05 | Perspectives in Mathematics: Algebras and Representations. Conference dedicated to the 60th birthday of Claus Michael Ringel, Bielefeld |
| 07.01.05 | Bielefeld Representation Theory Seminar |
| Lecture 'Cartan determinants for gentle algebras' |
| 15.12.04 | Hannover Algebra Seminar |
| Lecture 'Cartan-Determinanten für freundliche Algebren' | |
| 10.12.04-11.12.04 | Co-organizer 4th ARTIN Meeting (Algebra and Representation Theory In the North), Leeds |
| 29.11.04 | University of Kent, Canterbury, Mathematics Seminar |
| Lecture 'Algebras, Representations and Homology' | |
| 19.10.04 | Bristol Pure Mathematics Seminar |
| Lecture 'Homological Algebra in Representation Theory, or: how complicated is an algebra?' | |
| 18.09.04-24.09.04 | Research stay, University of Oxford |
| 13.09.04-17.09.04 | Conference Algebre non commutative artinienne, representations et cohomologies. CIRM, Luminy |
| 09.09.04 | BLOC Colloquium, Leicester |
| Lecture 'Derived equivalences for selfinjective tame algebras' | |
| 22.07.04 | Paderborn Representation Theory Seminar |
| Lecture 'Derived equivalences for selfinjective tame algebras' | |
| 16.07.04 | Workshop Representation Theory of Finite Groups and Finite Dimensional Algebras , Hannover |
| Lecture 'Representation dimension of tame Schur algebras' | |
| 14.07.04 | Working Seminar Rouquier blocks of symmetric groups , Hannover |
| 07.06.04-11.06.04 | Research stay, University of Oxford |
| 10.06.04 | Oxford Representation Theory Seminar |
| Lecture 'Conjectures on Brauer character degrees of finite groups' | |
| 17.05.04-22.05.04 | Workshop and Conference Lie Algebras, their Classification and Applications, Braunschweig, Germany |
| 23.04.04-24.04.04 | 2nd ARTIN Meeting (Algebra and Representation Theory In the North) , Sheffield |
| 09.02.04-13.02.04 | Second Sino-German Workshop on Representation theory and the theory of finite groups, Goslar, Germany |
| Lecture 'Representation dimension of group algebras and related algebras' (11.02.04) |
| 17.10.03-18.10.03 | Conference Darstellungstheorietage 2003, Universität Jena, Germany | |
| 18.09.03 | University of Leeds | |
| Lecture 'Algebras, Representations and Homological Algebra' | ||
| 10.09.03-17.09.03 | Conference Frobenius Algebras and Related Topics, Torun, Poland | |
| Lecture 'Derived equivalences for weakly symmetric algebras of Euclidean and tubular types' (15.09.03) | ||
| 17.07.03 | Universität Hannover, Germany, Algebra Seminar | |
| Lecture 'Algebren, Darstellungen und Homologische Algebra' | ||
| 27.06.03-29.06.03 | Workshop Algebraic Groups, Hecke Algebras and Abstract Representation Theory, Bielefeld, Germany | |
| Lecture 'Derived invariants of algebras' (27.06.03) | ||
| 25.04.03 | Colloquium, Universität Marburg, Germany | |
| Lecture 'Algebren, Darstellungen und Homologische Algebra' | ||
| 31.03.03-04.04.03 | Workshop Hochschild cohomology and applications, Leicester | |
| Lecture 'Hochschild cohomology of tame blocks' (02.04.03) | ||
| 28.03.03 | Leicester Pure Mathematics Colloquium | |
| Lecture 'The representation dimension and how to determine it' | ||
| 27.03.03 | Birmingham Algebra Colloquium | |
| Lecture 'Derived equivalences and invariants of algebras' |
| 18.11.02-22.11.02 | Symposium 'Twenty Years of Tilting Theory', Fraueninsel (Chiemsee), Germany |
| Lecture 'Representation dimension and the finitistic dimension conjecture for special biserial algebras' (18.11.02) | |
| 08.11.02-09.11.02 | Conference Darstellungstheorie-Tage 2002, Kassel, Germany |
| Lecture 'Auslander's Darstellungsdimension' (09.11.02) | |
| 01.10.02-10.10.02 | Research stay, Nicholas Copernicus University Torun, Poland |
| 08.10.02 | Nicholas Copernicus University Torun, Algebra Colloquium |
| Lecture 'Derived equivalence of algebras' | |
| 03.10.02 | Nicholas Copernicus University Torun, Representation Theory Seminar |
| Lecture 'Auslander's representation dimension and radical embeddings' | |
| 20.09.02 | Beijing Normal University, Algebra Seminar |
| Lecture 'The representation dimension of algebras' | |
| 17.09.02-23.09.02 | First Sino-German Workshop on Representation Theory and Finite Simple Groups, Beijing |
| Lecture 'Blocks of groups with dihedral, semidihedral or quaternion Sylow 2-subgroups' | |
| 01.07.02-11.07.02 | LMS Research Symposium Representations of finite groups and related algebras, Durham |
| Lecture 'Auslander's representation dimension' (04.07.02) | |
| 26.06.02-01.07.02 | Research stay, University of Oxford |
| 24.05.02 | Representation Theory Seminar, Universität Bielefeld, Germany |
| Lecture 'Gruppenalgebren mit zahmem Darstellungstyp' | |
| 10.03.02-24.03.02 | Research stay, Université de Lausanne |
| 13./20.03.02 | Université de Lausanne, Algebra Seminar |
| Two Lectures 'Blocks of group algebras: an introduction to tame representation type' | |
| 04.02.02-15.02.02 | Research stay, University of Oxford |
| 14.02.02 | University of Oxford, Representation Theory Seminar |
| Lecture 'Tame blocks and related algebras' | |
| 30.01.02 | Habilitation in Mathematics, Universität Magdeburg, Germany |
| Referees: C. Bessenrodt (Magdeburg), M. Broué (Paris), K. Erdmann (Oxford), C.M. Ringel (Bielefeld) |
| 22.10.01-26.10.01 | Colloque 'Catégories dérivées et groupes finis', Luminy, France |
| 25.03.01-31.03.01 | Oberwolfach-Conference 'Representations of Finite Groups' |
| Lecture 'Hochschild cohomology of tame blocks' (29.03.01) | |
| 22.03.01-24.03.01 | Conference 'Richard Brauer: Taking his ideas into the 21st century', Stuttgart, Germany |
| 31.08.00-07.09.00 | Research stay, Budapest, Technical University |
| 04.09.00 | Renyi Institute Budapest, Algebra Seminar |
| Lecture 'Hochschild Cohomology of Group Algebras and Blocks' | |
| 31.08.98-05.09.98 | Conference ICRTA 8.5, Bielefeld, Germany |
| Lecture 'Twisted bimodules and Hochschild cohomology' (04.09.98) | |
| 15.09.97-25.09.97 | Summer School 'Representation Theory of Algebras, Finite and Reductive Groups', Cluj-Napoca, Romania |
| Lecture Course (7 Lectures) 'Derived categories and equivalences' | |
| 27.05.97-01.06.97 | Third Chemnitz-Prague-Torun Algebra Symposium, Torun, Poland |
| Lecture 'Algebras of dihedral, semidihedral and quaternion type - Derived equivalences and tameness' (30.05.97) | |
| 18.04.97 | Bielefeld-Chemnitz-Seminar, Universität Bielefeld, Germany |
| Lecture 'Algebras of dihedral, semidihedral and quaternion type - Derived equivalences and tameness' | |
| 27.11.96 | Leciester Pure Mathematics Colloquium |
| Lecture 'Derived Equivalences and Hochschild Cohomology' | |
| 25.08.96-30.08.96 | Conference 'Representation Theory of Finite Groups', Bad Honnef, Germany |
| Lecture 'Homological Properties of Tame Blocks' | |
| July 96 | AMS Summer Research Institute 'Cohomology, Representations and Actions of Finite Groups', Seattle |
| Lecture 'Homological Properties of Tame Blocks' (15.07.96) | |
| 04.06.96 | Oxford Algebra Seminar |
| Lecture 'Homological Properties of Blocks of Group Algebras' | |
| 17.05.96 | Conference 'Darstellungstheorietage 1996', Jena, Germany |
| Lecture 'Deriviert äquivalente zahme Blöcke' | |
| 01.04.96-31.03.97 | Research stay, University of Oxford |
| supported by a Forschungsstipendium of the DFG | |
| Project: Hochschild cohomology and modular representation theory | |
| 01.02.96-31.03.96 | Research stay, University of Cambridge, DPMMS |
| 06.03.96 | Cambridge Algebra Seminar |
| Lecture 'Cohomological Properties of Blocks of Finite Groups' | |
| Sept 95 | Jahrestagung DMV, Ulm, Germany |
| Lecture 'Nilpotente Blöcke und ihre Hochschild-Kohomologieringe' | |
| June 95 | Prize for outstanding doctoral dissertations, Universität Essen, Germany |
| 20.12.94 | Representation Theory Seminar, Bielefeld, Germany |
| Lecture 'Hochschild Cohomology in Modular Representation Theory' | |
| Sept 94 | Jahrestagung DMV, Duisburg, Germany |
| Lecture 'Hochschild-Kohomologie von Blöcken mit zyklischer Defektgruppe' | |
| Sept 94 | Summer School and Workshop 'Derived Equivalences', Pappenheim, Germany |
| Lecture 'Hochschild Cohomology of Blocks with Cyclic Defect Groups' | |
| 01.04.92-31.03.94 | Doctoral grant from the Deutsche Forschungsgemeinschaft (DFG) |
| Graduiertenkolleg 'Theoretische und Experimentelle Methoden der Reinen Mathematik', Universität Essen, Germany |
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