• 19th Belgian Workshop on Mathematical OPtimization, March 7-8, 2013
• Meeting of the GOR working group "Real World Optimization", Karlsruhe, April 11-12, 2013
• DORS (Dansk Selskab for Operationsanalyse) Workshop "Applications of Optimization", Copenhagen, May 29, 2013
• TRISTAN VIII, San Pedro de Atacama, Chile, June 9-14, 2013
• EURO/INFORMS, Rome, July 2013
• OR2013, Rotterdam, September 2013

• 17th Combinatorial Optimization Workshop, Aussois, January 7-12, 2013
• SICS konferens om industriell effektivitet, The Swedish Institute of Computer Science, Stockholm, February 11, 2013
  Keynote: Industrial optimization - Lessons learned from optimization in practice
• ERGO Seminar, Edinburgh Research Group in Optimization, U of Edinburgh, February 13, 2013
  Title: GCG: a generic branch-price-and-cut solver
• Big data workshop 2013, Goethe University Frankfurt, March 4, 2013
  Title: Brainstorming on big data and optimization

• 11th International Symposium on Experimental Algorithms (SEA 2012), Bordeaux, France, June 7-9, 2012
  Plenary: Automatic Decomposition and Branch-and-Price: A Status Report
• International Workshop on Column Generation 2012, Bromont, Canada, June 10-13, 2012
  Title: Generic branch-price-and-cut: a status report
• Annual Meeting of SPP Algorithm Engineering 2012, Frankfurt, July 2-4, 2012
• International Symposium on Mathematical Programming (ISMP) 2012, Berlin, August 19-24, 2012
  Title: A generic branch-price-and-cut solver
• 12th Conference of the IFIP Working Group 7.6 on Advanced Analytics, Aachen, August 29-31, 2012
  Title: Solving integer programs by branch-and-price (automatically, since three weeks)
• OR 2012, Hannover, September 4-7, 2012
  Tutorial: A generic branch-price-and-cut solver
• SCIP Workshop 2012, TU Darmstadt, October 8, 2012
  Title: Column generation
• 3. Brazilian-German Frontiers of Science and Technology Symposium (BRAGFOST), Brasilia, November 8-11, 2012
  Title: Solving huge integer programs to optimality
• Operations Research Seminar, ORSTAT, KU Leuven, December 3, 2012
  Title: Column generation and branch-and-price: why and how?

• 15th Combinatorial Optimization Workshop, Aussois, January 10-14, 2011
  Title: Partial convexification of general MIPs
• Maastricht University, Department of Quantitative Economics, Operations Research Seminar, February 22, 2011
  Title: Tiny steps towards automated Dantzig-Wolfe reformulation
• Københavns Universitet, DIKU, March 28, 2011
  Title: Dantzig-Wolfe reformulations of general MIPs
• Symposium of the GOR working group "real world optimization", Bad Honnef, April 7-8, 2011
  Title: Would the world be different without branch-and-price?
• INFORMS conference on business analytics and operations research, Chicago, April 10-12, 2011
  Title: Operations research enlarges the world's busiest artificial waterway
• Annual Meeting of SPP Algorithm Engineering 2011, Berlin, May 2-4, 2011
• Kolloquium "Optimierung und Operations Research", TU Dortmund, May 9, 2011
  Title: Automatic decomposition of integer programs?
• SIAM conference on optimization, Darmstadt, May 16-19, 2011
  Title: Detecting structures in matrices
• 15th Conference on Integer Programming and Combinatorial Optimization (IPCO), Armonk, NY, June 15-17, 2011
• Mixed Integer Programming Workshop MIP2011, U Waterloo, June 20-23, 2011
  Title: Towards automatic Dantzig-Wolfe decomposition
• International Conference on Operations Research, Zurich, August 30-September 2, 2011
  Title: Improved column generation for highly degenerate master problems
• Mathematisches Kolloquium, Fachgruppe Mathematik, RWTH, November 29, 2011
  Title: Strukturen in ganzzahligen Programmen

• 14th Combinatorial Optimization Workshop, Aussois, January 3-9, 2010
• DMV Jahrestagung, Munich, March 8-12, 2010
  Title: Integer programs for university course timetabling
• MathInside - Mathematik ist überall, Urania, Berlin, March 23, 2010
  Title: Wir haben den Kanal voll - Diskrete Optimierung hilft dem Schiffsverkehr im Nord-Ostsee-Kanal
• 9th International Symposium on Experimental Algorithms (SEA 2010), Ischia Island (Napoli), Italy, May 20-22, 2010
• Annual Meeting of SPP Algorithm Engineering 2010, Halle, June 16-18, 2010
• Seventh Triennial Symposium on Transportation Analysis (TRISTAN 7), Tromsø, Norway, June 20-25, 2010
  Title: Nested Column Generation for a Ship Routing and Scheduling Problem with Split Pickup and Split Delivery
• Operations Research (OR), Munich, September 1-3, 2010
  Title: Nested Column Generation for a Ship Routing and Scheduling Problem with Split Pickup and Split Delivery
• ALGO, Liverpool, UK, September 6-10, 2010
• DFG SPP Workshop on Algorithm Engineering in Optimization, Cologne, December 3, 2010

• 13th Combinatorial Optimization Workshop, Aussois, January 11-17, 2009
  Title: Sorting with complete networks of stacks
• DFG SPP Workshop Algorithm Engineering for Integer Programming, Kiel, May 7-8, 2009
  Title: Generische Dekompositionsalgorithmen für ganzzahlige Programme
• Dagstuhl seminar on Models and Algorithms for Optimization in Logistics, June 21-26, 2009
• European Conference on Operational Research, EURO XXIII, Bonn, July 5-8, 2009
  Semiplenary: Sequencing and Scheduling in Coil Coating with Shuttles
• 20th International Symposium on Mathematical Programming, Chicago, August 23-28, 2009
  Title: Ship Traffic Optimization for the World's Busiest Artificial Waterway
• Symposium of the GOR working group "real world optimization", November 19-20, 2009
  Title: Branch-and-price (in public transportation problems)

• Mathematisches Kolloquium, Technische Universität Clausthal, Germany, February 22, 2008
  Title: Ganzzahlige Programme in diskreter Optimierung und industriellen Anwendungen
• Mathematisches Kolloquium, Technische Universität Dortmund, Germany, May 6, 2008
  Title: Ganzzahlige Programme in diskreter Optimierung und industriellen Anwendungen
• Vortragsreihe Operations Research, Universität Karlsruhe (TH), Germany, May 16, 2008
  Title: Schwierige ganzzahlige Programme aus Produktion und Logistik
• Workshop on Experimental Algorithms (WEA), Provincetown, MA, May 30 - June 1, 2008
  Title: Optimal university course timetables and the partial transversal polytope
• Column Generation 2008, Aussois, June 17-20, 2008
• Oberseminar Effizienz dezentraler Strukturen, Lehrstuhl für Wirtschaftsmathematik, Universität Bayreuth, Germany, July 7, 2008
  Title: Ein ganzzahliges Programm für das University Course Timetabling Problem
• Operations Research (OR), Augsburg, Germany, September 2-5, 2008
  Title: Optimal University Course Timetabling
• European Symposium on Algorithms (ESA), Karlsruhe, Germany, September 15-17, 2008
• International Symposium on Algorithms and Computation (ISAAC), Gold Coast, Australia, December 15-17, 2008

• 11th Combinatorial Optimization Workshop, Aussois, January 7-12, 2007
  Title: Optimizing the Cargo Express Service of Swiss Federal Railways
• Kolloquium "Optimierung und Operations Research", Universität Dortmund, January 25, 2007
  Title: Intelligentes Stapeln: Transportoptimierung in einem Brammenlager
• Colloquium of the Research Training Group "Methods for Discrete Structures", FU Berlin, January 29, 2007
  Title: Computational Mixed Integer Programming
• Festkolloquium 60th anniversary of Uwe Zimmermann, TU Braunschweig, April 27, 2007
  Title: Rangieren und Stapeln: Praktische Lösungen für schwere Probleme
• Operations Research 2007, Saarbrücken, September 4-7, 2007
  Title: Conflict-free Vehicle Routing
• 15th Annual European Symposium on Algorithms (ESA), Eilat, Israel, October 8-10, 2007
• 5th Workshop on Approximation and Online Algorithms (WAOA), Eilat, Israel, October 11-12, 2007

• 10th Combinatorial Optimization Workshop, Aussois, January 8-13, 2006
• High Performance Scientific Computing, Hanoi, Vietnam, March 6-10, 2006
  Title: Industrial Railroad Operations: Optimal Switching, Routing, and Scheduling
• Seminar, Centre for Traffic and Transport, Technical University of Denmark, Copenhagen, March 24, 2006,
  Title: Towards Industrial Railroad Optimization: Switching, Routing, and Scheduling
• ARRIVAL Kick-off meeting, Patras, Greece, March 30-31, 2006
  Title: A Column Generation Approach to Freight Train Routing at Swiss Railways
• GERAD Summer school on column generation, Montréal, Canada, May 15-19, 2006
  Title: Column Generation: Basic Theory (6 hour lecture)
• Operations Research 2006, Karlsruhe, September 6-8, 2006
  Title: A Column Generation Approach to Freight Train Routing at Swiss Railways
• ARRIVAL/Matheon Fall School 2006 on Timetabling and Line Planning, Dabendorf, September 26-29, 2006
  Title: IP Techniques for Large Networks: Column Generation
• Symposium Metallindustrie und Mathematik, Physikzentrum Bad Honnef, November 2-3, 2006
  Title: Flüssiger Stahl auf der Schiene: Optimierung des rollenden Materials bei Werkseisenbahnen

• Algorithms for Optimization with Incomplete Information, Dagstuhl, January 16-21, 2005.
• 9th Combinatorial Optimization Workshop, Aussois, March 13-19, 2005
• 4th International Workshop on Efficient and Experimental Algorithms (WEA 05), Santorini Island, Greece, May 10-13, 2005
• XI. IPCO, Berlin, June 8-10, 2005
• IMA "Hot Topics" Workshop: Mixed-Integer Programming, Minneapolis, July 25-29, 2005
  Poster: Locomotives and Rail Cars: Switching, Routing, and Scheduling
• EuroComb'05, Berlin, September 5-9, 2005
• Combinatorial Optimization, Oberwolfach, November 6-12, 2005
  Title: Towards Industrial Railroad Optimization: Switching, Routing, and Scheduling

• 8th Combinatorial Optimization Workshop, Aussois, January 4-9, 2004
  Title: Rectangle covers revisited computationally
• 15th ACM-SIAM Symposium on Discrete Algorithms (SODA04), New Orleans, LA, January 11-13, 2004
  Title: Minimizing the stabbing number of matchings, trees, and triangulations
• SIGOPT, International Conference on Optimization, Wittenberg, February 15-18, 2004
  Title: Rectangle covers revisited computationally
• Colloquium within the European Graduate Program "Combinatorics, Geometry and Computation", FU Berlin, April 19, 2004
  Title: Covering polygons by rectangles
• Berliner Algorithmen Tag 2004, TU Berlin, July 12, 2004
• Operations Research 2004, Tilburg, The Netherlands, September 1-3, 2004
  Title: Compressing wavelet-transformed images via rectangle covers
• Kolloquium "Optimierung und Operations Research", Universität Dortmund, November 17, 2004
  Title: Einschränken der Ladebedingungen beim Pickup and Delivery Problem: Gut für Theorie und Praxis
• Oberseminar über Diskrete Optimierung, Universität Dortmund, November 18, 2004
  Title: Rectangle covers revisited computationally

• 7th Combinatorial Optimization Workshop, Aussois, March 9-15, 2003
  Title: On the stabbing number of matchings, trees, and triangulations
• 19th European Workshop of Computational Geometry, Bonn, Germany, March 24-26, 2003
• ROUTE 2003, International Workshop on Vehicle Routing, Skodsborg, Denmark, June 22-25, 2003
  Title: On Compact Formulations for Integer Programs Solved by Column Generation, invited
• BMBF-Workshop Verkehr, Transport, Logistik, Energiewirtschaft, Lahmeyer International, Bad Vilbel, Germany, June 26-27, 2003
  Title: Optimales Wagenmanagement bei Werks- und Industriebahnen
• 18th International Symposium on Mathematical Programming, August 18-22, 2003, Copenhagen, Denmark
  Title: On the stabbing number of matchings, trees, and triangulations
• International Conference on Operations Research 2003, September 3-5, 2003, Heidelberg, Germany
  Title: On Compact Formulations for Integer Programs Solved by Column Generation
• GOR Workshop "Optimierung im Öffentlichen Nahverkehr", November 13-14, 2003, ZIB, Berlin
  Title: Optimales Rangieren
• Netzwerktag, DFG-Forschungszentrum Mathematik für Schlüsseltechnologien, December 15, 2003, TU Berlin

• BMBF-Workshop Verkehr, Transport, Logistik, Energiewirtschaft, DB Systems, Frankfurt, Germany, February 28-March 1, 2002
  Title: Optimale Rangierauftragsbildung bei Industriebahnen
• Seminar, Department of Computing and Information Science, Queen's University, Kingston, Ontario, Canada, May 14, 2002,
  Title: Optimal Rail Car Allocation
• Combinatorial Optimization Seminar, Department of Combinatorics and Optimization, University of Waterloo, Ontario, Canada, May 16, 2002,
  Title: Minimum Turn Cycle Covers in Grid Graphs
• Seminar, Department of Applied Mathematics and Statistics, University at Stony Brook, NY, USA, May 20, 2002,
  Title: Minimum Turn Cycle Covers in Grid Graphs
• Second Summer School on Integer Programming and Combinatorial Optimization, MIT, Cambridge, MA, USA, May 25-26, 2002
• IPCO2002, Ninth Conference on Integer Programming and Combinatorial Optimization, MIT, Cambridge, MA, USA, May 27-29, 2002
• GERAD Seminar, Group for Research in Decision Analysis, Montréal, Canada, May 31, 2002,
  Title: Optimal Rail Car Allocation
• Algorithms Seminar, School of Computer Science, McGill University, Montréal, Canada, June 3, 2002,
  Title: Minimum Turn Cycle Covers in Grid Graphs
• Forum "Mathematik in der BASF", Ludwigshafen, Germany, June 27, 2002
• OR2002, International Conference on Operations Research, Klagenfurt, Austria, September 2-5, 2002
  Title: Minimum Turn Cycle Covers in Grid Graphs
  Title: Optimal Rail Car Allocation
• Tag der Mathematik und Informatik, Braunschweig, Germany, September 25, 2002
  Workshop: Das Geheimnis des kürzesten Weges
• 3rd Research Seminar on Railway Optimization Problems, October 1-4, 2002, Oegstgeest, The Netherlands
  Title: Rail Car Allocation Problems
• Combinatorial Optimization, Oberwolfach, Germany, November 24-30, 2002, invited
  Title: Minimum Turn Cycle Covers in Grid Graphs

2001

• 5th Combinatorial Optimization Workshop, Aussois, March 5-9, 2001
  Title: Combinatorial Restrictions on Pickup and Delivery Paths
• BMBF-Workshop Verkehr, Transport, Logistik / Energietechnik und -wirtschaft, Technische Universität Berlin, Germany, April 5-6, 2001
  Title: Optimales Wagenmanagement bei Werks- und Industriebahnen
• OR2001, Symposium on Operations Research, Duisburg, Germany, September 3-5, 2001,
  Title: Modeling the Freight Car Management at Industrial Plants
• Dissertantenseminar, Vienna University of Technology, Algorithms and Data Structures Group, Austria, October 8, 2001, invited
  Title: Engine Scheduling by Column Generation
• Mathematisches Kolloquium, Brandenburgische Technische Universität Cottbus, Germany, November 13, 2001, invited
  Title: Einsatzplanung von Rangierlokomotiven mittels Spaltengenerierung
• Mathematical Methods in Manufacturing and Logistics, Oberwolfach, Germany, December 16-21, 2001, invited
  Title: Optimal Rail Car Allocation Problems

2000

• CASPT-2000, 8th International Conference "Computer-Aided Scheduling of Public Transport", Berlin, Germany, June 21-23, 2000
  Title: Scheduling of Switching Engines in Practice
• ISMP2000, 17th International Symposium on Mathematical Programming, Atlanta, GA, USA, August 7-11, 2000
  Title: Pickup and Delivery Paths of Restricted Combinatorial Structure
• ROUTE2000, International Workshop on Vehicle Routing, Skodsborg, Denmark, August 16-19, 2000, invited
  Title: Pickup and Delivery Paths of Restricted Combinatorial Structure
• OR2000, International Conference on Operations Research, Dresden, Germany, September 9-12, 2000
  Title: Scheduling the Rolling Stock of Private Railroads
• AMORE Research Seminar on Railway Optimization Problems, Konstanz, Germany, October 16-20, 2000, invited
  Title: Engine Scheduling and Column Generation
• Status seminar of the BMBF research program New Mathematical Methods in Industry and Service, Frankfurt/Main, Germany, December 11-12, 2000

1999

• Status seminar of the BMBF research program Mathematical Methods for Solving Problems in Industry and Business, Erlangen, Germany, February 17-19, 1999
• MAPSP99, Fourth Workshop on Models and Algorithms for Planning and Scheduling Problems, Renesse, The Netherlands, June 14-18, 1999
  Title: A Column Generation Approach to Engine Scheduling
• DO99, Workshop on Discrete Optimization, Rutgers University, NJ, USA, July 25-30, 1999
  Title: On Combinatorially Restricted Pickup and Delivery Paths
• DIMACS Workshop on the Theory and Practice of Integer Programming in honor of Ralph E. Gomory on the Occasion of his 70th Birthday, IBM Watson Research Center, Yorktown Heights, NY, USA, August 2-4, 1999
• Symposium on Operations Research 1999, Magdeburg, Germany, September 1-3, 1999
  Title: Engine Scheduling in Absence of Time Tables
• Traffic and Transport Optimization, Oberwolfach, Germany, November 7-13, 1999, invited
  Title: Optimal Engine Scheduling at Industrial In-Plant Railroads
• Mathematisches Kolloquium 1999, Forschungsseminar "Diskrete Mathematik und Optimierung", Gerhard-Mercator-Universität Duisburg, Germany, November 17, 1999, invited
  Title: Optimale Disposition von Rangierlokomotiven bei Werks- und Industriebahnen: Vom Bedarf zum Produkt
• Modellierung und Simulation von Verkehr, Arbeitskreis Mathematik in Forschung und Praxis, Physikzentrum Bad Honnef, Germany, November 18-19, 1999, invited
  Title: Optimale Disposition von Rangierlokomotiven bei Werks- und Industriebahnen: Vom Bedarf zum Produkt

1998

• Combinatorial and Global Optimization, Chania, Crete, Greece, May 25-29, 1998
  Title: Mixed Integer Formulation of a Locomotive Scheduling Problem at Industrial Freight Railroads
• 29. Session of GOR working group on logistics, Hildesheim, Germany, July 2-3, 1998
• Colloquium on Intermodal Transport, Braunschweig University of Technology, Germany, July 15, 1998
• International Conference on Operations Research 1998, Zürich, Switzerland, August 31 - September 3, 1998
  Title: Computational Study of an Engine Scheduling Problem at Industrial Freight Railroad Companies
• Bonn Workshop on Discrete Optimization, Bonn, Germany, September 28 - October 2, 1998
  Title: Engine Scheduling at Industrial Freight Railroad Companies
• 1. BMBF Workshop Diskrete Optimierung, Verkehr und Einsatzplanung, Konrad-Zuse-Zentrum Berlin, Germany, November 9, 1998
  Title: Umlaufplanung im Güterverkehr bei Werks- und Industriebahnen

1997

• Third Joint IuK Workshop Multimedia in den Wissenschaften, Würzburg, Germany, March 3-5, 1997
• Duisburger Kongress Mathematik in Industrie und Wirtschaft, Duisburg, Germany, March 10-13, 1997
• Mediengestützte wissenschaftliche Weiterbildung, Braunschweig, Germany, March 20-21, 1997
• Workshop Preparing the Future, EXPO2000 GmbH, Hanover, Germany, July 7, 1997
• ISMP 97 - XVI. International Symposium on Mathematical Programming, EPFL, Lausanne, Switzerland, August 24-29, 1997
  Title: The Vertex Set of a 0-1 Polytope is Strongly P-Enumerable
• Symposium on Operations Research 1997, Jena, Germany, September 3-5, 1997
  Title: The Vertex Set of a 0-1 Polytope is Strongly P-Enumerable
• Status seminar of the BMBF research program Mathematical Methods for Solving Problems in Industry and Business, Heidelberg, Germany, October 29-31, 1997
• Workshop on Computational Integer Programming, ZIB Berlin, Germany, November 16-18, 1997

1996

• Symposium on Operations Research 1996, Braunschweig, Germany, September 3-6, 1996
  Title: Algorithms for Enumerating all Vertices and Facets of Convex Polyhedra
• Summer School Discrete Optimization, Hamburg Harburg, Germany, September 9-13, 1996
• Workshop Metadaten und Strukturierung elektronischer Information, SUB Göttingen, Germany, December 15-17, 1996