Selected Talks

1. The Burial of Coupling Constraints in Linear Bilevel Optimization
   Invited seminar talk at the Center for Mathematical Modeling (CMM)
   March 12, 2025. Santiago de Chile. Chile

2. A Gentle and Incomplete Introduction to Bilevel Optimization
   11th Winter School on Network Optimization
   January 20, 2025. Estoril, Portugal

3. BOBILib: Bilevel Optimization (Benchmark) Instance Library
   Talk at the PGMODays 2024
   November 10, 2024. Paris, France

4. BOBILib: Bilevel Optimization (Benchmark) Instance Library
   Talk at the ISMP 2024 (Slides)
   July 24, 2024. Montréal, Canada

5. A Gentle and Incomplete Introduction to Bilevel Optimization
   Plenary talk at the 24th edition of the Belgian Mathematical Optimization Workshop
   April 22, 2024. La Roche-en-Ardennes, Belgium

6. A Primer on Bilevel Optimization Under Uncertainty
   Invited talk at the seminar of the WIAS
   February 20. 2024. Berlin, Germany

7. A Primer on Bilevel and Robust Optimization
   Invited mini course lectures at the 3rd International Workshop on Bilevel Optimization – IWOBIP'24
   January 22, 2024. Rancagua, Chile

8. Learning the Follower's Objective Function in Sequential Bilevel Games
   Talk at the PGMODAYS 2023.
   November 28, 2023. Paris, France.

9. The Minimum Sum-of-Squares Clustering Problem: Robustification and Global Optimization Techniques
   Invited talk in the NeEDS online seminar series. Recording of talk at YouTube.
   November 13, 2023.

10. A Primer on Bilevel Optimization Under Uncertainty
    Invited seminar talk at the Università degli Studi di Brescia
    November 7, 2023. Brescia, Italy

11. 15 Years of Gas Network Optimization
    Plenary talk at the Conference on Applied, Computational and Algorithmic Optimization (CACAO) 2023
    September 25, 2023. Leibniz Universität Hannover, Germany

12. Connections Between Bilevel and Robust Optimization
    Robust Optimization Webinar (ROW) Series
    September 22, 2023, via Zoom

13. Matchmaking Bilevel and (Γ-)Robust Optimization
    Plenary talk at the International Conference on Bilevel Optimization
    August 10, 2023, Southampton, UK

14. A Successive Mixed-Integer Linear Relaxation Method for MINLPs with Lipschitz Continuous Nonlinearities
    Learning from Both Sides Linear and Nonlinear Mixed-Integer Optimization
    July 6, 2023. Institut Mittag-Leffler, Stockholm, Sweden

15. On a Computationally Ill-Behaved Bilevel Problem with a Continuous and Nonconvex Lower Level
    Minisymposium talk at the SIAM Conference on Optimization (OP23)
    May 31, 2023, Seattle, USA

16. Block Decomposition of Large-Scale MINLPs and (Penalty) Alternating Direction Methods
    Plenary talk at the III Sevilla MINLP Workshop
    March 30, 2023, University of Seville, IMUS, Spain

17. Mathematik - Wozu? Über Graphentheorie und Google
    Schülervortrag im Rahmen der Veranstaltungsreihe “Mathematik erFassen!”
    March 8, 2023, Universität Trier, Germany

18. Bilevel Optimization: Some Basics, the European Gas Market under Uncertainty, and an Open Research Problem
    Invited talk in the Seminar of the Institute of Applied Mathematics at the Leibniz Universität Hannover
    March 2, 2023, Hannover, Germany

19. A Primer on Bilevel Optimization Under Uncertainty
    Invited talk at the Department of Computer, Control and Management Engineering of Sapienza, Università di Roma
    February 6, 2023, Rome, Italy

20. The Minimum Sum-of-Squares Clustering Problem: Robustification and Global Optimization Techniques
    Invited talk at the ESSEC Business School Paris
    November 17, 2022, Paris, France

21. Bilevel Optimization: Some Basics, the European Gas Market under Uncertainty, and an Open Research Problem
    Invited talk in the AdONE Seminar at TU München
    November 7, 2022, München (via Zoom), Germany

22. Some Recent Results and Thoughts on Bilevel Optimization Under Uncertainty
    Plenary talk at the Dagstuhl seminar “Optimization at the Second Level”
    November 2, 2022, Dagstuhl, Germany

23. The Minimum Sum-of-Squares Clustering Problem: Robustification and Global Optimization Techniques
    Invited talk in the OASYS Seminar Series at the University of Málaga
    September 26, 2022, Málaga, Spain

24. Multilevel Optimization: Basics, an Application to the European Gas Market, and an Open Research Problem
    Invited talk in the seminar series of the Institut of Mathematik at the Humboldt-Universität zu Berlin
    August 22, 2022, Berlin, Germany

25. Recent algorithmic advances in bilevel optimization
    Keynote talk at the 32nd EURO Conference
    Aalto University, Espoo, Finland, July 5, 2022
    The slides are available here.

26. A “Survey” on Mixed-Integer Programming Techniques in Bilevel Optimization
    32nd EURO Conference
    Aalto University, Espoo, Finland, July 4, 2022
    The slides are available here.

27. Multilevel Optimization: Basics, an Application to the European Gas Market, and an Open Research Problem
    Plenary talk at the SIAM UKIE National Student Chapter Conference
    University of Edinburgh, Scotland, June 23, 2022
    The slides are available here.

28. Some best practices and pitfalls of solving bilevel optimization problems
    Second International Workshop on “Variational Analysis and Applications for Modelling of Energy Exchange” (VAME 2022)
    University of Brescia, Italy, May 10, 2022

29. The Cost of Not Knowing Enough: Mixed-Integer Optimization with Lipschitz Nonlinearities
    Invited talk in the seminar series of the department of mathematics at KTH Stockholm
    KTH Stockholm, Sweden, May 2, 2022

30. On Convex Lower-Level Black-Box Constraints in Bilevel Optimization with an Application to Gas Market Models with Chance Constraints
    Virtual talk (via Zoom) in the ENRE Online Scientific Event series
    The Zoom recordings are freely available online here.
    April 28, 2022

31. A brief history of linear optimization
    Talk in the seminar series “Math History Lectures”
    Trier University, April 13, 2022.

32. Mixed-Integer Programming Techniques for the Minimum Sum-of-Squares Clustering Problem
    Virtual talk in the Séminaire du GERAD series
    GERAD, February 24, 2022. Slides. YouTube

33. Multilevel mixed-integer nonlinear optimization for electricity market design: Motivation, models, solution techniques, and results
    Virtual seminar series "enOPTIMAL" at the interface of energy, optimization and machine learning research (Zoom)
    MIT, December 17, 2021

34. On Convex Lower-Level Black-Box Constraints in Bilevel Optimization with an Application to Gas Market Models with Chance Constraints
    PGMO Days 2021
    30.11.-1.12.2021, Paris
    The slides are freely available here

35. A Gentle and Incomplete Introduction to Bilevel Optimization (lecture series)
    UNIVERS Winter School on Optimization, Games and Markets
    14.-17.11.2021, TU Chemnitz

36. Existence of Energy Market Equilibria with Convex and Nonconvex Players (via Zoom)
    Trans-Atlantic Infraday Conference 2021 at Aalto University, Finland
    12.11.2021, Espoo, Finland

37. Outer Approximation for Global Optimization of Mixed-Integer Quadratic Bilevel Problems
    EURO 2021 Conference
    13.7.2021, Athens, Greece

38. A Gentle and Incomplete Introduction to Bilevel Optimization (lecture series; via Zoom)
    JPOC Spring School on MINLP and Bilevel Problems
    23.6.2021, Paris (Zoom)
    You can find the corresponding lecture notes here.
    The recordings of these lecture are available on YouTube:
    MINLP Lecture 1, MINLP Lecture 2, MINLP Lecture 3, Bilevel Lecture 1, Bilevel Lecture 2, Bilevel Lecture 3

39. Mixed-Integer Nonlinear Optimization (lecture series; via Zoom)
    JPOC Spring School on MINLP and Bilevel Problems
    22.6.2021, Paris (Zoom)

40. Decomposition Methods for Robustified k-Means Clustering Problems (via Zoom)
    ECMI 2021 conference
    14.4.2021, Bergische Universität Wuppertal

41. Die Mathematik der Energiewende (via Zoom)
    #LecturesForFuture der Universität Trier
    3.2.2021, Universität Trier

42. (Mixed-Integer) Nonlinear Optimization for District Heating Networks (via BigBlueButton)
    Oberseminar “Numerical Optimization”
    15.12.2020, Universität Konstanz

43. Robust Linear Complementarity Problems (via Zoom)
    Weekly Seminar on Optimization and Equilibrium Problems: Models, Applications, Algorithms
    26.10.2020, University of Maryland, Baltmore, USA

44. Robust Linear Complementarity Problems (via Zoom)
    Seminar of the Institute of Mathematical Optimization, TU Braunschweig
    26.6.2020, TU Braunschweig, Germany

45. Mathematik - Wozu? Über Graphentheorie und Google
    Tag der Mathematik
    15./16.10.2019, Universität Trier, Germany

46. Mixed-Integer Optimization: State of the Art and Applications
    Invited Talk, NEC Laboratories Europe GmbH
    2.10.2019, Heidelberg, Germany

47. (Γ-)Robustified Market Equilibrium Models and (Γ-)Robust LCPs
    The XV International Conference on Stochastic Programming 2019
    1.8.2019, NTNU Trondheim, Norway

48. A Global Outer Approximation Algorithm for Mixed-Integer Quadratic Bilevel Problems
    30th European Conference on Operational Research
    26.6.2019, Dublin, Ireland

49. Penalty alternating direction methods: Theory, practice, and their relation to feasibility pumps
    Mathematisches Kolloquium der TU Ilmenau
    15.5.2019, TU Ilmenau, Germany

50. Mathematik - Wozu? Über Graphentheorie und Google
    Mathematik erFassen!
    2.4.2019, Universität Trier, Germany

51. A Multilevel Model of the European Entry-Exit Gas Market
    2nd Conference on Mathematics of Gas Transport
    10.10.2018. Berlin, Germany

52. The Impact of Physics on Market Equilibria in Energy Networks
    ISMP 2018. 23rd International Symposium on Mathematical Programming
    4.7.2018. Bordeaux, France

53. Combining Network Design and Graph Partitioning in a Multilevel Framework for Electricity Markets
    IWOBIP'18. 2nd International Workshop on Bilevel Programming
    22.6.2018. INRIA Lille-Nord Europe, France

54. Price Zones and Investment Incentives in Electricity Markets: An Application of Multi-Level Optimization with Graph Partitioning
    13. ÖGOR-IHS Workshop & ÖGOR Arbeitskreis "Mathematische Ökonomie und Optimierung in der Energiewirtschaft" 2018
    17.5.2018. Institut für Höhere Studien, Wien

55. Mathematik - Wozu? Über Graphentheorie und Google
    Schülervortrag am Dürer-Gymnasium Nürnberg
    2.5.2018. Nürnberg

56. Network Expansion, Price Zones, and Investment Incentives in Electricity Markets: An Application of Multi-Level Optimization to the German Electricity Market
    Invited talk in the workshop"Mathematical Algorithms for Comprehensive Energy Management Systems" at Siemens
    5.4.2018. Erlangen

57. Mathematische Optimierung im Energiebereich
    Invited talk at sonnen GmbH
    20.3.2018. Wildpoldsried

58. Mixed-Integer Optimization for Energy Systems
    661. WE-Heraeus-Seminar "Nonlinear Dynamics, Optimization and Control of Distributed Energy Systems"
    29.1.2018. Bad Honnef

59. Mathematik für die Energiewende
    Lange der Nacht der Wissenschaften 2017
    21.10.2017. Nürnberg

60. MIP-based instantaneous control of mixed-integer PDE-constrained gas transport problems
    IFORS 2017
    18.7.2017. Quebec City

61. Penalty Alternating Direction Methods for Mixed-Integer Nonlinear Optimization
    SIAM Conference on Optimization 2017
    24.5.2017. Vancouver

62. Mathematical Optimization for Energy Networks
    Recent Advances in Renewable Energy Technologies
    3.4.2017. Texas A&M University at Qatar. Doha

63. Optimal Price Zones of Electricity Markets: A Mixed-Integer Multilevel Model and Global Solution Approaches
    Workshop Energiemärkte
    16.2.2017. Energie Campus Nürnberg

64. Optimal Price Zones of Electricity Markets: A Mixed-Integer Multilevel Model and Global Solution Approaches
    21st Combinatorial Optimization Workshop
    9.1.2017. Aussois

65. Penalty Alternating Direction Methods for Mixed-Integer Optimization: A New View on Feasibility Pumps
    OR 2016 - Annual International Conference of the German Operations Research Society
    31.08.2016. Hamburg

66. Optimal Price Zones for the German Electricity Market
    iSEnec 2016 - Integration of Sustainable Energy Conference
    12.7.2016. Nürnberg

67. A Penalty Alternating Direction Method for Nonconvex MINLPs in Gas Transport
    EURO 2016 - 28th European Conference on Operational Research
    5.7.2016. Poznan

68. Graph Partitioning with Connectivity Constraints for Multilevel Electricity Market Models
    TU Braunschweig. Seminar des Instituts für Mathematische Optimierung
    23.6.2016. Braunschweig

69. Von mehrstufiger Optimierung und Stromnetzen, Graphpartitionierung und Marktpreisen
    Unsere Fakultät - Unsere Forschung. Friedrich-Alexander-Universität Erlangen-Nürnberg
    20.6.2016. Erlangen

70. Feasibility Pumps as Penalty Alternating Direction Methods for MINLPs: Theory and Computations
    Leibniz Universität Hannover, Oberseminar Algorithmische Optimierung
    19.5.2016. Hannover

71. Mixed-Integer Nonlinear Optimization of Stationary Gas Transport Problems
    TU Berlin, Kolloquium ModNumDiff
    17.5.2016. Berlin

72. Gemischt-ganzzahlige nichtlineare Optimierung für den Gas- und Stromtransport
    Universität Konstanz, Seminar der AG Numerik (Fachbereich Mathematik & Statistik)
    11.5.2016. Konstanz

73. Investition in Netz und Erzeugung in liberalisierten Strommärkten
    11th ÖGOR – IHS Workshop on "Mathematical Economics and Optimization in the Energy Sector" 2016
    27./28.4.2016. Institut für Höhere Studien (IHS). Wien

74. Transmission and Generation Investment in Liberalized Electricity Markets
    OR 2015 - Annual International Conference of the German Operations Research Society 2015.
    3.9.2015. Wien

75. Solving Power-Constrained Gas Transport Problems using an MIP-based Alternating Direction Method
    ISMP 2015 - 22nd International Symposium on Mathematical Programming
    17.07.2015. Pittsburgh

76. Transmission and Generation Investment in Electricity Markets: The Effects of Market Splitting and Network Fee Regimes
    Oberseminar Algorithmische Optimierung. Leibniz Universität Hannover
    23.02.2015. Hannover

77. State-of-the-Art in Gas Transport Optimization
    Workshop on Gas Transport and Gas Market Modeling
    15.12.2014. Energie Campus Nürnberg.

78. Continuous Reformulations for Mixed-Integer Nonlinear Optimization of Gas Compressor Stations
    International Conference on Operations Research 2014 (OR 2014)
    3.9.2014. Aachen

79. Optimierung - Die Mathematik der Energiewende
    Tag der Erlanger Mathematik
    4.7.2014. Erlangen

80. Nonlinear Programming Techniques for Gas Transport Optimization Problems
    SIAM Conference on Optimization 2014
    19.5.2014, San Diego

81. A Generic Interior-Point Framework for Nonsmooth and Complementarity Constrained Nonlinear Optimization
    Disputationsvortrag
    23.1.2013, Hannover

82. Mixed-Integer Nonlinear Optimization of Gas Compressor Stations
    International Annual Conference of the German OR Society 2012 (OR 2012).
    6.9.2012. Hannover

83. An Extended Interior Point Method for Nonsmooth and Complementarity Constrained Nonlinear Optimization in Gas Networks
    21st International Symposium on Mathematical Programming (ISMP)
    23.8.2012. TU Berlin

84. Sequential NLP Solving for High-Accuracy Nonlinear Optimization Models in Gas Networks
    25th IFIP TC 7 Conference on System Modeling and Optimization
    14.9.2011. TU Berlin

85. MPEC Based Primal Heuristics for MINLPs
    SIGOPT - International Conference on Optimization 2011
    16.6.2011. Pfalz-Akademie Lambrecht

86. An MINLP Primal Heuristic for Gas Networks
    SIAM Conference on Optimization
    16.5.2011. Darmstadt

87. Gemischt-ganzzahlige nichtlineare Optimierung von Gasnetzwerken
    InfoMaTech - Vortragsreihe der Forschungskreise der FHDW Hannover
    16.2.2011. Hannover

88. High Accuracy Stationary Optimization in Gas Networks
    24th European Conference on Operational Research
    12.7.2010. Lissabon

89. KronCrypt - Der Approximationssatz von Kronecker in der symmetrischen Kryptographie
    9. Kryptotag der Fachgruppe "Angewandte Kryptologie" der Gesellschaft für Informatik e.V.
    10.11.2008. Gelsenkirchen