Bernard Ries

 +41 26 300 8333

Relations internationales



Optimisation combinatoire

Théorie des graphes structurelle et algorithmique

Modélisation mathématique

Complexité computationnelle


PER 21 bu. C324
Bd de Pérolles 90
1700 Fribourg
PER 21, C324

Professeur·e ordinaire
Département d'informatique

PER 21 bu. C324
Bd de Pérolles 90
1700 Fribourg
PER 21, C324


Biography: In 2007, I received my PhD in mathematics from Ecole Polytechnique Fédérale de Lausanne(CH). From 2008 to 2009, I was a Postdoctoral Research Fellow at Columbia University (US) in the Department of Industrial Engineering and Operations Research. In 2009-2010, I was appointed as Assistant Professor at the University of Warwick (UK) in the Center for Discrete Mathematics and its Applications (DIMAP) and the Warwick Business School (WBS). From September 2010 to July 2015, I was an Associate Professor at the Université Paris Dauphine (F) in the Computer Science and Mathematics Department. Currently I am a Professor at the University of Fribourg (CH), where I am heading the Decision Support & Operations Research Group together with Marino Widmer in the Department of Informatics. In 2022, I joined the Smart Living Lab project with some members of my team.

My main research interests are:

  • Structural and algorithmic graph theory
  • Combinatorial optimization
  • Computational complexity
  • Mathematical Modeling


Phd Students:

  • Nathanael Barrot: 2012 - 2015 (currently postdoc at RIKEN Research Center in Japan)
    (co-supervisor: Jérôme Lang (Université Paris Dauphine))
  • Esther Galby: 2015 - 2020 (currently Postdoc at Technische Universität Hamburg, Germany)
  • Vera Fischer: 2018 - 2023 (co-supervision with Meritxell Pacheco)
  • Felix Mann: 2019 -
  • Felicia Lucke: 2020 -
  • Narmina Baghirova: 2020 - (co-supervision with David Schindl)
  • Elise Bangerter: 2023 - (co-supervision with Meritxell Pacheco)


Visiting PhD students:

  • Zakir Deniz (2017, Duzce University (Turkey))
  • Pierre Hauweele (2018, Université de Mons (Belgium))
  • Paloma Thomé de Lima (2018, University of Bergen (Norway))
  • Carolina Goncalvez (20021, 2022, University of Buenos Aires (Argentina))


Member of PhD committees:

  • Grégoire Cotté, Conservatoire National des Arts et Métiers, Paris, France (2016)
  • Vasileios Papapanagiotu, Università della Svizzera Italiana, Lugano, Switzerland (2018)
  • Gauvain Devillez, Université de Mons, Belgium (2022)
  • Nikolaos Melissinos, Université Paris Dauphine PSL, France (2022)
  • Valentin Bouquet, Conservatoire National des Arts et Métiers, Paris, France (2022)
  • Pierre Hauwelee, Université de Mons, Belgium (2023)



  • Diana Sasaki: 2014 - 2015 (now Professor at Universidade do Estado do Rio de Janeiro (Brazil))
  • Maria Pia Mazzoleni: August 2017 (now Docencia at Universidad Nacional La Plata (Argentina))
  • Andrea Munaro: February - June 2018 (now Lecturer at Queen's University Belfast (UK))
  • Zakir Deniz: September - December 2019
  • Meritxell Pacheco: January 2021 - August 2021 (now Senior Researcher and Lecturer at University of Fribourg (CH))
  • Jérôme De Boeck: March 2022 - August 2023 (now Assistant Professor at HEC Liège, Belgium)

Recherche et publications

Enseignement et cours

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