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• Algebra and Geometry Seminar , Dec. 9, Baasel, Schweiz.
• Aldo Conca , (University of Genova, Italy), Koszul property of the projections of the Veronese surface, November 18, HS V.
• International School on Computational Commutative Algebra and Algebraic Geometry , Oct. 17-29, Messina, Italy.
• SIAM Conference on Applied Algebraic Geometry , Minisymposium on Combinatorial Structures in Algebraic Statistics , October 6-9,Raleigh, USA.
• Amin Seyedfakhari (Sharif University, Tehran, Iran) Stanley Depth of Powers of Edge Ideals of Forests and Regina Gente (Marburg) The Varchenko Matrix for Cones, September 29, 4pm-6pm.
• Hery Randriamaro (Marburg) The Multiplication Map of the Descent Algebra, September 23, 3pm.
• Sarfraz Ahmad (Comsat Lahore, Pakistan) Stanley Decompositions and Polarization and Kathrin Vorwerk (KTH Stockholm, Sweden) Embeddability of Buildings, September 22, 4pm-6pm.
• Anda Olteanu (Ovidius University, Romania) Monomial Cut Ideals and Lukas Katthän (Marburg) Commutative Algebra of Statistical Ranking Models, September 15, 4pm-6pm.
• Simplicial Complexes satisfying Serre conditions, Siamak Yassemi (Tehran University and IPM), July 7, 5pm, HS V.
• Algebra and Geometry Seminar , University of Genova, Italy, June 20-25 2011.
• SIAM Conference on Optimization , Minisymposium on Algorithms for Ranking , May 16-19, Darmstadt, Germany.
• Minikolloquium on "Algebraic and Stochastic Methods in Convex Geometry" , April 7.-8.,Osnabrück, Germany.
• Seminaire Lotharingien , March 6-8., 2011, Ellwangen, Germany.
• Topological and Geometric Combinatorics Oberwolfach, Feb, 6.-12. 2011, Oberwolfach Germany.
• Göbner bases of Pfaffian ideals Emanuela De Negri (University of Genova), Colloquium, Jan. 28, 2010.
• Combinatorics Oberwolfach, Jan 2.-8., 2011, Oberwolfach Germany.
• Poset fiber theorems and some applications, Martina Kubitzke (University of Vienna) and Moon Polyominoes, Pipe Dreams and Simplicial Spheres, Christian Stump (Universite du Quebec a Montreal UQAM), Colloquium, Dec. 21. 2010.
• Complimentary Program MSRI , Nov. 1.-21., Berkeley, USA.
• Combinatorics Seminar , Nov. 10., University of Washington, USA.
• Computational Algebra , Oct. 17-25., Messina.
• Intensive Research Period Configuration Spaces May-June 2010, Pisa.
• Symposium Diskrete Mathematik 2010 , May 14-15 2010, Universität Wien
• Colloquium , April 8, 2010 University of Buenos Aires, Argentina.
• Mathematical Lectures , March 9-15, 2010 IPM, Tehran.
• Departmental Seminar , February 2 2010, National University Galway.
• Monday Lecture Methods for discrete Structures, FU-Berlin, November 16.
• Colloquium des Fachbereichs, 29. Januar, 2010, Christian Haase (FU Berlin): Der Grad eines Gitterpolytops
• Combinatorial Structures in Algebra and Geometry Osnabrück, October 8-10.
• Geometric and Combinatorial Aspects of Commutative Algebra , Messina, Italy, September 16-18.
• FPSAC 2009 Linz, Austria, July 20-24, 2009
• Kolloquium Osnabrück, July 8, 2009.
• Commutative Algebra and Applications to Combinatorics and Algebraic Geometry , Tehran, Iran, June 27-30, 2009
• Conference in Honor of Ralf Fröberg , Stockholm, Sweden, June 12-16, 2009
• MatheMonatMai: Veranstaltung in Marburg zum Thema Mathematik und Demokratie
• Colloquium des Fachbereichs, 9.April 2009, Christos Athanasiadis (Athen): Combinatorics of Arrangements of Hyperplanes
• CIMPA School on Computational and Combinatorial Aspects of Commutative Algebra , Lahore, Pakistan, February 21-28, 2009.
• Algebraic Topology Conference Buenos Aires, November 10-14, 2008
• Colloquium University of Athens
• 23rd British Topology Meeting , Queens University Belfast.
• Colloquium des Fachbereichs, 6. August 2008, Reinhard Laubenbacher (Vrginia Tech):
• PRAGMATIC 2008 Summerschool on Free resolutions and Hilbert series: algebraic, combinatorial and geometric aspects.
• Colloquium des Fachbereichs, 13. Juni 2008, Joachim Hornegger (Erlangen): Algorithmen für bldgebende Verfahren in der Kardiologie
• FESTIVE Combinatorics 2008 Conference in honor of Anders Björner.
• MathFilmfestival 2008 , Marburg 20. und 22. Mai 2008.
• Colloquium des Fachbereichs, 9. Mai 2008, Frank-Olaf Schreyer (Universität Saarbrücken): Betti Zahlen von graduierten Moduln und Kohomologie von Vektorbündeln
• Vortrag im Oberseminar Kombinatorik: 7.Mai 2008, Christian Stump (Universität Wien) q,t-Fuss-Catalan Zahlen
• Tagung der Fachgruppe Diskrete Mathematik der Deutschen Mathematiker Vereinigung 2.-3. Mai 2008.
• Gauss-Vorlesung Marburg 16.11.2007, 16.30 Uhr, Alte Aula.
• Dienstag 10. April 2007: Die Ergebnisse der Jahresabschlussklausur Lineare Algebra hängen aus (Brett gegenüber Aufgang zu HS IV)
• Minisymposium on Discrete Mathematics within the DVM/GDM-meeting in Berlin March 26.-30. 2007.
• Während meines Aufenthalts am MSRI vom 26. August bis 15. September 2006 finden keine Sprechstunden statt. Prüfungsangelegheiten und Sonstiges bitte per E-Mail welker@mathematik.uni-marburg.de .
• Joint AMS-SIAM Summer Research Conference June 11-June 15, Snowbird, Utah, USA. Detailed Information now available !!
• Biannual Meeting of the DMV Discrete Mathematics Special Interest Group Berlin, April 3 - April 4.
• During a Micro-Workshop on Combinatorial Commutative Algebra in Marburg on February 22, 2006, Jürgen Herzog points to new directions of research in the field.
  
  From left to right : Martina Kubitzke, Xinxian Zheng, Volkmar Welker, Tim Römer, Jürgen Herzog