Talks since 1996 (Selection)

Title Conference Date
Hyperbolic groups with spheres as boundary and a stable version of the Cannon Conjecture Conference "manifolds and groups", Regensburg September 2017
Survery on The Farrell-Jones Conjecture and its application Workshop "K-theory in topology and non commutative geometry, TP K-Theory and Related Fields HIM, Bonn August 2017
Aspherical manifolds, what we know and what we do not know Colloquium, Augsburg May 2017
The Farrell-Jones Conjecture and its application Seminar, Paris 7 March 2017
Aspherical manifolds, what we know and what we do not know Colloquium, Freiburg November 2016
The group cohomology of certain crystallographic groups and applications Workshop: The Farrell-Jones conjecture, JTP Topology HIM, Bonn October 2016
Universal L^2-torsion, Twisted L^2-Euler characteristic, Thurston norms and polytopes Workshop: New directions in L2-invariant, JTP Topology HIM, October 2016
Universal L^2-torsion, Twisted L^2-Euler characteristic, Thurston norms and polytopes Conference Measured Topology, Oberwolfach August 2016
The Farrell-Jones Conjecture for Waldhausen's A-theory, automorphism groups of aspherical manifolds, and approximately fibering manifolds Conference: Topology of manifolds (Michael Weiss' 60th birthday) , Lisbon June 2016
Survey on L^2-invariants Conference: Algebra in Geometry (Erik Pedersen 70th birthday) , Copenhagen June 2016
Introduction to L^2-Betti numbers Colloquium, Fribourg (Switzerland) June 2016
L^2-Euler characteristics and the Thurston norm Geometric Topology Seminar, MPI for Mathematics, Bonn April 2016
The group cohomology of certain crystallographic groups and applications Conference Topological and Homological Methods in Group Theory Topology Seminar, Bielefeld April 2016
Universal torsion, L2-invariants, polytopes and the Thurston norm Topology Seminar, Münster December 2015
Introduction to L^2-Betti numbers Colloquium, Düsseldorf November 2015
Survey on L^2-invariants BICMR-HCM: Beijing meets Bonn November 2015
Aspherical manifolds, what we know and what we do not know Clay Research Conference Algebraic Topology: manifolds unlocking higher structures, Oxford September 2015
Survey on L^2-torsion Workshop Manifolds and Groups, Ventotene September 2015
Universal torsion, L^2-invariants, polytopes and the Thurston norm PIMS Symposium on the Geometry and Topology of Manifolds, Vancouver July 2015
Introduction to the Farrell-Jones Conjecture PIMS Symposium on the Geometry and Topology of Manifolds, Vancouver July 2015
Universal torsion, L^2-invariants, polytopes and the Thurston norm The 32nd Annual Workshop in Geometric Topology, Fort Worth June 2015
Introduction to the Farrell-Jones Conjecture The 32nd Annual Workshop in Geometric Topology, Fort Worth June 2015
Introduction to L^2-invariants The 32nd Annual Workshop in Geometric Topology, Fort Worth June 2015
Introduction to the Farrell-Jones Conjecture Colloquium, Bayreuth June 2015
Introduction to the Farrell-Jones Conjecture I + II Follow workshop Rigidity, HIM, Bonn April 2015
Universal torsion, L^2-invariants, polytopes and the Thurston norm Conference Asymptotic Invariants of Groups, Oxford April 2015
K-theory of group algebras and topological cyclic homology Conference Homotopy Theory, Oberwolfach March 2015
Introduction to homology and L^2-cohomology Kolloquium, Dresden February 2015
Universal L^2-torsion, Twisted L^2-Euler characteristic, Thurston norm and higher order Alexander polynomials Conference Geometric Topology, Oberwolfach January 2015
Was und wie zählt man im Alltag und in der modernen Mathematik? Kolloquium zur Didaktik der Mathematik, Karlsruhe December 2014
Introduction to L^2-cohomology Colloquium, Warrick November 2014
Hyperbolic groups with spheres as boundary Geometry and Topology Seminar, Warrick November 2014
Homological methods in mathematics Programm DEMAIN -Workshop, Münster September 2014
The twisted L^2-torsion function and its application to $3$-manifolds Conference Topology, Oberwolfach September 2014
The twisted L^2-torsion function and its application to $3$-manifolds Conference Low-dimensional Topology and Number Theory, Oberwolfach August 2014
Was und wie zählt man im Alltag und in der modernen Mathematik? Kolloquium über Didaktik Geschichte und Didaktik der Mathematik, Münster June 2014
From the classification of Cuntz-Li-C^*-algebras to the cohomology of crystallographic groups Oberseminar Topology, Göttingen June 2014
L^2-Invariants, their applications and open problems Oberseminar Globale Analysis, Regensburg May 2014
Survey about L^2-Invariants and their applications colloquium, Augsburg May 2014
Introduction to the Farrell-Jones Conjecture topology seminar, Augsburg May 2014
Algebraic K- and L-theory of groups rings and their applications to topology and geometry NRW topology meeting, Wuppertal May 2014
What are the possible values of L^2-Betti numbers topology seminar, Edinburgh April 2014
Introduction to L^2-invariants colloquium, Edinburgh April 2014
Algebraic K- and L-theory of groups rings and their applications to topology and geometry topology seminar in Berkey April 2014
Introduction to the middle K-theory of group rings and their relevance in topology topology seminar in Berkey April 2014
Was und wie zählt man im Alltag und in der modernen Mathematik? Felix-Hausdorff-Vorlesung im Alfried Krupp Wissenschaftskolleg Greifswald January 2014
Heat kernels and their applications in geometry, topology and group theory. Bethe Kolloquium of Institute for Physics in Bonn January 2014
Survey on open problems about L^2-invariants: Atiyah's Question, Singer's conjecture, homological growth and Lehmer's problem for arbitrary groups Topology Oberseminar, Münster December 2013
L^2-invariant and homological growth Seminar Homology Growth in Geometry and Arithmetic at MPI in Bonn November 2013
Introduction to L^2-invariants Seminar Homology Growth in Geometry and Arithmetic at MPI in Bonn November 2013
Survey on L^2-invariants Colloquium of the Department of Mathematics of the Columbia University, New York October 2013
Hyperbolic groups with spheres as boundary CUNY, New York October 2013
Introduction to the Farrell-Jones Conjecture Colloquium of the Courant Institute, New York October 2013
Hyperbolic groups with spheres as boundary Conference Geometry, Groups and Topology 2013, Karlsruhe October 2013
K_0 and Wall's finiteness obstruction, Lecture I Topology of high-dimensional manifolds, Summer School in Bonn August 2013
K_1 and Whitehead torsion, Lecture II Topology of high-dimensional manifolds, Summer School in Bonn August 2013
The Isomorphism Conjectures in the torsionfree case, Lecture III Topology of high-dimensional manifolds, Summer School in Bonn August 2013
The Isomorphism Conjectures in general, Lecture IV Topology of high-dimensional manifolds, Summer School in Bonn August 2013
Status and Methods of Proof, Lecture V Topology of high-dimensional manifolds, Summer School in Bonn August 2013
Approximation L^2-invariants and homological growth Conference Group theory, Measure, and asymptotic invariants, topology and geometry, Oberwolfach August 2013
Survey on L^2-invariants Colloquium, Leibzig July 2013
On the Farrell-Jones Conjecture Colloquium, Berlin July 2013
Fulgede-Kadison determinants and L^2-torsion Conference Growth and Mahler measure in geometry and topology, Mittag-Leffler Institute, Djursholm, Sweden July 2013
From the classification of Cuntz-Li-C^*-algebras to the cohomology of crystallographic groups Geometric Structures in Group Theory, Oberwolfach June 2013
Survey on Isomorphism Conjectures SYM lecture, Copenhagen May 2013
Survey on L^2-invariants Colloquium, Copenhagen May 2013
Survey on L^2-invariants 20-th anniversary of ESI, Erwin-Schrödinger Institut, Vienna April 2013
From the classification of Cuntz-Li-C^*-algebras to the cohomology of crystallographic groups MPI Oberseminar, Bonn February 2013
Homological growth and L^2-invariants Hirzebruch Lecture Münster December 2012
L^2-invariants and applications to group theory Cohomological Methods in Geometric Group Theory, Banff November 2012
Motivating the Farrell-Jones Conjecture Topology, Oberwolfach September 2012
Homological growth and L^2-invariants Low-Dimensional Topology and Number Theory, Oberwolfach August 2012
Status and Methods of Proof Topology and Groups, Summerschool, Berlin June 2012
The Isomorphism Conjectures in general Topology and Groups, Summerschool, Berlin June 2012
The Isomorphism Conjectures in the torsionfree case Topology and Groups, Summerschool, Berlin June 2012
Lower and middle K-theory Topology and Groups, Summerschool, Berlin June 2012
L^2-Betti numbers their applications Joint colloquim Marburg and Gießen, Marburg June 2012
L^2-approximation and homological growth Topology Oberseminar, Münster January 2012
L^2-approximation and homological growth Conference Stratified Spaces: joining analysis, topology and geometry, Oberwolfach December 2011
On the Farrell-Jones Conjecture Sektion Geometrie-Topologie, DMV-Jahres-Tagung in Köln September 2011
Approximating in prime characteristic Workshop L^2 invariants and their relatives for finitely generated groups at AIM in Palo Alto September 2011
Approximating the first L^2-Betti number of residually finite groups Topology Seminar at Münster July 2011
The flow space associated to a CAT(0)-space Summer school Geodesic Flow, Negative Curvature and Isomorphism Conjectures in Göttingen June 2011
Strategy of proof: From Farrell-Jones to flow spaces Summer school Geodesic Flow, Negative Curvature and Isomorphism Conjectures in Göttingen June 2011
The Farrell-Jones Conjecture Summer school Geodesic Flow, Negative Curvature and Isomorphism Conjectures in Göttingen June 2011
Introduction to Algebraic K-theory Summer school Geodesic Flow, Negative Curvature and Isomorphism Conjectures in Göttingen June 2011
Approximation of L^2-torsion and homological growth Conference Finite Approximations of discrete groups, Oberwolfach May 2011
An introduction to the Farrell-Jones Conjecture Conference New directions in algebraic K-theory, Oberwolfach May 2011
Approximating L^2-torsion and homological growth Oberseminar Global Analysis in Bonn December 2010
Constructing infinite, finitely generated, residually finite torsion groups with positive first L^2-Betti number Oberseminar Topology in Bonn December 2010
On the Farrell-Jones Conjecture and its applications Conference K-theory, C*-algebras, index theory in Göttingen November 2010
Approximating l^2-invariants by their finite dimensional ananalogues Kolloquium Bonn October 2010
K- and L-theory of group rings Topology section, ICM 2010, Hyderabad August 2010
On hyperbolic groups with spheres as boundary Kolloquium Heidelberg July 2010
On hyperbolic groups with spheres as boundary The Third GAF-conference Group actions in Topology and Geometric Group Actions in Poznan June 2010
On hyperbolic groups with spheres as boundary Kolloquium Osnabück June 2010
The Farrell-Jones Conjecture for hyperbolic and CAT(0)-groups Conference Non-positive curvature and geometric structures in group theory, Oberwolfach April 2010
Lebendige Mathematik, auch abseits des Lehrplans? 101. MNU Bundeskongress 2010, Bielefeld March 2010
On hyperbolic groups with spheres as boundary Copenhagen Topology Conference January 2010
On hyperbolic groups with spheres as boundary Kolloquium Bonn / Workshop: Rigidity in cohomology, K-theory, geometry and ergodic theory at the HIM in Bonn November 2009
Introduction to and new results about the Farrell-Jones Conjecture Oberseminar Topologie, Bonn November 2009
Warum bin ich eigentlich Mathematiker geworden ? 3. Bildungskongress Münster: Individuelle Förderung multipler Begabungen, Münster September 2009
Das Chamäleon Mathematik Nordrhein-Westfälische Akademie der Wissenschaften und der Künste, Düsseldorf September 2009
Introduction to the Farrell-Jones Conjecture Summerschool Geometry and Rigidity of groups at Münster August 2009
Topologische Starrheit Kolloquium (Wilhelm Singhof's sixtieth birthday) , Düsseldorf July 2009
Introduction to the Farrell-Jones Conjecture Focused semester on K-theory, Münster June 2009
Die Sprache, die Faszination und die Bedeutung der Mathematik Kolloquium Geschichte und Didaktik der Mathematik, Münster June 2009
On the Borel Conjecture and related topics Conference on manifold pespectives, Oberwolfach May 2009
L^2-torsion, Whitehead groups and group automorphisms Oberseminar Globale Analysis, Bonn April 2009
On the Borel Conjecture and related topics Ferry Fest, Chicago March 2009
Die Farrell-Jones-Vermutung und ihre Anwendungen Göttingen February 2009
K- and L-theory von Gruppenringen und topologische Starrheit Colloquium, Hamburg January 2009
Topological Rigidity BMS-Friday, Berlin November 2008
Die Sprache, die Faszination und die Bedeutung der Mathematik Veranstaltung zum Jahr der Mathematik, Bremen November 2008
Die Sprache, die Faszination und die Bedeutung der Mathematik Herbstforum 2008, Lüdinghausen November 2008
Topologische Starrheit Colloquium, Bochum November 2008
K- and L-theory von Gruppenringen und topologische Starrheit Colloquium, Paderborn November 2008
K- and L-theory of group rings and topological rigidity Conference ``Von Neumann algebras and ergodic theory of group actions´´, Oberwolfach October 2008
K- and L-theory of group rings and topological rigidity Colloquium, Regensburg October 2008
On the Borel Conjecture and related topics ''Analytic properties of infinite groups'', conference , Geneva August 2008
On the topological rigidity of aspherical manifolds 5-th European Congress of Mathematics, invited lecture, Amsterdam July 2008
Die Sprache, die Faszination und die Bedeutung der Mathematik Veranstaltung zum Jahr der Mathematik und zum 60. Geburtstag von Andrew Ranicki, Münster June 2008
Topological rigidity Colloquium de Mathematiques, Jussieu, Paris May 2008
On the conjectures of Bost and of Baum-Connes and the generalized trace conjecture Seminar operator algebras, Jussieu, Paris May 2008
On the Borel Conjecture and related topics ``Singularities in geometry and topology'', in honor of Cappell's syitieth birthday, Courante Institut, New York March 2008
The Burnside ring, equivariant homotopy and the Segal Conjecture for infinite groups 2008 Spring Eastern Meeting New York, March 2008
On the Borel Conjecture and related topics Topology seminar, Berkeley March 2008
On the Borel Conjecture and related topics Kolloquium, Stanford February 2008
The mystery of aspherical closed manifolds Kolloquium, Bonn November 2007
On the conjecture of Novikov and Borel Seminar des MPI Bonn, Bonn October 2007
The Burnside ring, equivariant homotopy and the Segal Conjecture for infinite groups Conference ``homotopy theory´´, Oberwolfach September 2007
Isomorphism Conjecture in K- and L-theory (six lectures) ``Cohomology of groups and algebraic K_theory´´, international summer school in Hangzhou, China July 2007
The K-theoretic Farrell-Jones Conjecture for hyperbolic groups Feier zum 90. Geburtstag von Beno Eckmann, ETH Zürich April 2007
The Farrell-Jones Conjecture and its applications Oberseminar Topologie, Bonn April 2007
The Farrell-Jones Conjecture and its applications Conference ``Lauch meeting for the journal of topology´´, Oxford March 2007
Topological rigidity for non-aspherical manifolds Conference ``Topology´´, Banff February 2007
Equivariant Chern characters Göttingen November 2006
Erfahrungen eines Hochschullehrers mit dem Lehramtsstudium Minisymposium Lehrerausbildung DMV-Tagung Bonn September 2006
The Farrell Conjecture for algebraic K-theory with arbitrary coefficients for word-hyperbolic groups ICM06 Satellite on ``K-theory and Noncommutative Geometry´´, Valladolid September 2006
Equivariant homology theory and assembly maps Conference ``Surgery theory: past, present and future´´, Edinburgh (Wall's 70-th birthday) July 2006
Burnside rings, equivariant homotopy and the Segal Conjecture for infinite groups Workshop ''Prospects in topology'', Münster June 2006
Burnside rings, equivariant homotopy and the Segal Conjecture for infinite groups Topology seminar at the Mittag-Leffler institute, Stockholm May 2006
The algebraic K-theory of the group ring of a word hyperbolic group with arbitrary coefficient ring Conference ``Topological and geometric methods in group theory´´, Oberwolfach April 2006
Isomorphism Conjectures in algebraic K- and L-theory and topological rigidity ``25-th anniversary of MPIM´´, MPIM Bonn April 2006
The Farrell Conjecture for algebraic K-theory with arbitrary coefficients for word-hyperbolic groups Conference ``Analysis and Topology in interaction´´, Oberwolfach March 2006
From finite groups to infinite groups Conference ``Cohomology of finite groups - Interactions and applications´´, Oberwolfach September 2005
L^2-invariants and applications Conference ``Topology´´, Banff August 2005
How to compute K- and L-groups of group rings of infinite groups Conference ``Algebraic K- and L-theory of infinite groups´´, Edinburgh June 2005
Klassifizierende Räume von Familien von Untergruppen Kolloquium des Fachbereichs Mathematik der Universität Mainz June 2005
The Baum-Connes Conjecture, trace maps and Chern characters Geometrie-Seminar des Fachbereichs Mathematik der Universität Köln June 2005
L^2-cohomology and geometric group theory Mathematische Arbeitstagung June 10-16 2005, Max-Planck-Institut für Mathematik, Bonn June 2005
Topologische Starrheit für nicht asphärische Mannigfaltigkeiten Kolloquium der Fachgruppe Mathematik der Universität Bonn June 2005
Middle algebraic K-theory of von Neumann algebras, group C^*-algebras and group rings Conference ``Non-commutative geometry and operator algebras´´, Nashville May 2005
The Baum-Connes Conjecture, trace maps and Chern characters Colloquium of the MPI for Mathematics, Bonn April 2005
Rational Computations of the Topological K-Theory of Classifying Spaces of Discrete Groups NRW-topology meeting, Bochum April 2005
Survey on L²-invariants Imperial College, London November 2004
Survey on classifying spaces Southampton November 2004
Equivariant Chern characters and applications to K- and L-theory Edinburgh November 2004
Equivariant Chern characters and applications to K- and L-theory Conference ``Noncommutative geometry´´, Oberwolfach September 2004
Isomorphism Conjectures in K- and L-theory 40-th anniversary of the FIMS at the ETH, Zürich July 2004
A Survey on the Baum-Connes Conjectures giornata INdAM, Rome June 2004
A panorama on L²-invariants and their applications SUP-Symposium Oslo May 2004
Klassifizierende Räume von Familien Colloquium, International University of Bremen November 2004
Rational injectivity of the Farrell-Jones assembly map for algebraic K-theory Geometry and analysis on manifolds (Dan Burghelea's sixtieth birthday), Columbus March 2004
Computations of K-and L-groups of group rings and C^*-algebras Conference ``Topology of manifolds and homotopy theory´´, Banff, March 2004
L²-cohomology Conference ``von Neumann algebras´´, C.I.R.M Luminy, February 2004
L²-Invariants Geometry and Cohomology in Group Theory, LMS Durham Symposium, Durham July 2003
Chern characters and applications to K- and L-theory International Conference on Group Theory: combinatorial, geometric and dynamical aspects of infinite groups in Gaeta (Italy) June 2003
Equivariant Chern characters and application to K- and L-theory Conference ``Algebraic K-theory and its applications´´, Trieste, July 2002
Equivariant Chern characters and application to K- and L-theory Aarhus topology conference 2002 June 2002
Vortragsreihe: ``L²-invariants´´ Borel Seminar in Bern April 2002
Vortragsreihe: ``L²-invariants´´ Conference/School in Lyon October 2001
The relation between the Baum-Connes Conjecture and the trace conjecture Conference ``High-dimensional manifold theory´´, Trieste June 2001
Vortragsreihe: ``Introduction to surgery'' School in Trieste June 2001
`Equivariant Chern characters Festkolloquium zu Mislin's 60. Geburtstag April 2001
The relation between the Baum-Connes Conjecture and the trace conjecture Conference ``Topological methods in group theory´´ in Oberwolfach January 2001
Equivariant Chern characters Conference ``Algebraic topology´´, Barcelona July 2000
Computing the source of the assembly map' Conference ``Noncommutative geometry´´ in Oberwolfach March 2000
Survey on L²-invariants Conference ``L²-methods and K-theory´´ in Oberwolfach September 1999
L²-invariants and singular spaces Conference ``From manifolds to singular varieties´´, Boulder June 1999
Dirac operators and index theory Conference ``Dirac operators and Spin geometry´´, Oberwolfach April 1999
Isomorphisms Conjectures in K-and L-theory and computations for certain crystallographic groups Workshop ``Stable homotopy theory and algebraic K-theory´´, Bielefeld February 1999
L²-Betti numbers and dimension functions Conference ``Geometry and topology'', Aarhus August 1998
The completion theorem in K-theory for proper actions of a discrete group Conference ``Algebraic topology´´, Barcelona June 1998
Generalized Novikov-Shubin invariants Conference ``Topology'', Tel Aviv June 1998
Spectra over a category and isomorphism conjectures of Baum-Connes and Farrell-Jones I, II and III Workshop ``K-homology of classifying spaces and K-theory of C*-algebras´´, Les Diablerets (Schweiz) March 1998
The completion theorem in K-theory for proper actions of a discrete group Conference ``Group actions on manifolds´´, Oberwolfach February 1998
Dimension functions over finite von Neumann algebras and applications to L²-Betti numbers Conference ``Prospects in geometry´´, Leipzig November 1997
Reidemeister torsion und L²-torsion Seifert-Colloquium in Heidelberg October 1997
L²-Torsion Conference ``Algebraic topology´´, Kazimierz (Polen) July 1997
Dirac operators and Spin geometry Workshop on ``Dirac operators on loop spaces´´, Oberwolfach June 1997
Dimension functions over finite von Neumann algebras and applications to L²-Betti numbers Eckmann-Colloquium in Zürich April 1997
Analytic theory of the Dirac operator I, II and III Conference ``Dirac operator and geometry´´, Warschau February 1997
Reidemeister Torsion und analytische Torsion Franz-Colloquium, Heidelberg November 1996
L²-Invarianten von Mannigfaltigkeiten und Gruppen DMV-Tagung in Jena September 1996
L²-torsion Conference ``Topology and analysis on singular spaces´´, Oberwolfach June 1996