Florian Schäfer

prof_pic.jpg

Warren Weaver Hall 409

251 Mercer Street

New York, NY 10012

I’m Florian Schäfer, assistant professor at the Courant Institute of Mathematical Sciences at New York University.

I received my PhD in applied and computational mathematics at Caltech, working with Houman Owhadi. Before that, I received my Bachelor’s and Master’s degrees in Mathematics at the University of Bonn. You can find a cv here.

My research interests lie at the interface of numerical computation, statistical inference, and competitive games. With my students and collaborators, I have developed state-of-the-art solvers for elliptic PDEs by relating Gaussian elimination to conditional independence, efficient algorithms for multi-agent optimization, and information geometric regularization, the first inviscid regularization of compressible fluid dynamics.

My work has found applications in materials science, turbulence modeling, computer graphics, and computational geometry. Most recently, it has enabled the first compressible fluid simulation to exceed one quadrillion degrees of freedom. This work is a 2025 Gordon Bell Prize finalist.

My current research focus is on developing information geometric mechanics that uses the statistical physical underpinnings of continuum mechanics to design structure preserving numerical methods at the macroscale.

I am currently hiring PhD students in this topic. Please have a look here to get an idea. If you have a strong background in computational mathematics, reach out!

news

Oct 25, 2025 This Wednesday, I am giving the Numerical Analysis Seminar at Texas A & M! Please reach out if you are there and want to chat!
Oct 25, 2025 This Monday, I am giving the Computational an Applied Mathematics Colloquium at Penn State. Thanks to Leonid Beryland for inviting me!
Oct 08, 2025 I am attending the Simons Institute Workshop on Linear Systems and Eigenvalue Problems this week! You can find a recording of my talk here.
Sep 30, 2025 I gave a talk at the MFEM Seminar (remotely) at LLNL. The recorded talk should soon appear on their website.
Sep 22, 2025 I am attending the AMG summit this week and will give a talk at Sandia National Laboratories on Thursday September 25.

selected publications

  1. Information geometric regularization of the barotropic Euler equation
    Ruijia Cao and Florian Schäfer
    2023
  2. Sparse recovery of elliptic solvers from matrix-vector products
    Florian Schäfer and Houman Owhadi
    SIAM Journal on Scientific Computing, 2024
  3. Sparse Cholesky factorization by Kullback-Leibler minimization
    Florian Schäfer, Matthias Katzfuss, and Houman Owhadi
    SIAM Journal on Scientific Computing, 2021
  4. Compression, inversion, and approximate PCA of dense kernel matrices at near-linear computational complexity
    Florian Schäfer, T. J. Sullivan, and Houman Owhadi
    Multiscale Model. Simul., 2021
  5. Competitive gradient descent
    Florian Schäfer and Anima Anandkumar
    Advances in Neural Information Processing Systems, 2019