I am a Professor at the University of Luxembourg partially supported by Fonds National de la Recherche Luxembourg. Here is my curriculum vitae as of September 2025. Here is a link to our Geometry-Topology Seminar.

Research Interests

• differential-geometric aspects of rigidity
• Lorentzian geometry
• conformal pseudo-Riemannian geometry and parabolic Cartan geometries in general
• smooth dynamics

Recent papers:

• A local Lorentzian Ferrand-Obata theorem for conformal vector fields, with Sorin Dumitrescu, Charles Frances, Vincent Pecastaing , and Abdelghani Zeghib
  pdf also posted at https://arxiv.org/abs/2511.03713
• An Embedding Theorem for tractor bundles, and an application in conformal psuedo-Riemannian geometry, with Katharina Neusser
  pdf also posted at https://arxiv.org/abs/2505.14665
• Closed conformally flat Lorentzian manifolds with unipotent holonomy, with Rachel Lee
  pdf also posted at http://arxiv.org/abs/2405.08410
• Smooth and analytic actions of SL(n,R) and SL(n,Z) on closed n-dimensional manifolds, with David Fisher
  pdf
  Kyoto Journal of Mathematics 64 no. 4 (2024) 873-904.
• The Lorentzian Lichnerowicz Conjecture for real-analytic, three-dimensional manifolds, with Charles Frances
  pdf
  Journal für die reine und angewandte Mathematik (Crelle's Journal) 2023 no. 803 (2023) 183-218.

All older papers:

Recent and upcoming talks and conferences

• Recent trends in differential geometry, Banach Center, Będlewo, Poland, July 2025.
• BeNeLux Mathematical Congress (co-organizer), University of Antwerp, Belgium, April 2026.
• Journée GAAG - Géométrie en Action et Actions en Géométrie, Nancy, France, September 2025.
• Geometry and Quantum Theory Colloquium, Nijmegen, Netherlands, August 2025.
• Université de Strasbourg: Séminaire Géométrie et applications, June 2025.
• Inauguration de la Fédération MaGE (de recherche en mathématiques de la région Grand-Est), Nancy, France, May 2025.
• Lorentzian, affine, and hyperbolic geometry: In memory of Todd Drumm (co-organizer), Brin Mathematics Research Center, College Park, MD, April 2025.
• Winter School in Geometric Analysis, Geilo, Norway, March 2025.
• Séminaire Géométrie et groupes discrets, Institut des Hautes Études Scientifiques, February 2025.
• Universität Regensburg SfB "Higher Invariants" Lecture, November 2024 (online).

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Teaching

In Winter 2025, I am teaching Lie groups and Lie algebras. Members of the course can access the moodle page here. In Summer 2026, I will be teaching Riemannian Geometry and Géométrie des courbes et des surfaces.