Recent news

• September 2026
  • Our paper on emulating floating-point matrix multiplication was accepted for publication in TOMS!
  • Our paper on mixed precision Cholesky with microscaling was accepted for publication in TOMS!
  • Our paper on sparse solvers for helioseismology was accepted for publication in JSC!
  • New preprint on probabilistic error analysis of LU factorization!
• August 2026
  • Our paper on mixed precision augmented GMRES was accepted for publication in NLAA!
• July 2026
  • New preprint on large-scale frequency-domain FWI!
  • Our paper on the quantization of butterfly matrices was accepted for publication in SISC!
  • New preprint on randomized interpolative decomposition!
  • New preprint on mixed precision Newton's method!
• June 2026
  • New preprint on precision emulation!
  • Our paper on the probabilistic estimation of the accuracy of inner products was accepted for publication in IMAJNA!
  • New preprint on mixed precision Cholesky with microscaling!
  • New preprint on mixed precision GMRES with memory accessors!
  • New preprint on mixed precision Tucker compression!
  • New preprint on adaptive precision GMRES!
• May 2026
  • I gave a talk at Preconditioning 2026 (Edinburgh) on the effect of precision on preconditioning.
  • New preprint on mixed precision domain decomposition preconditioners!
  • Our paper on mixed precision preconditioned GMRES was accepted for publication in IMAJNA!
• April 2026
  • Our paper on mixed precision neural network inference was accepted for publication in IMAJNA!
  • I gave a talk on mixed precision inference at a GDR IASIS workshop on frugality of neural networks.
  • Our paper on memory accessors was accepted for publication in ACM TOMS!
• February 2026
  • I gave a talk at Dagstuhl on adaptive precision algorithms.
• November 2025
  • Erin Carson and I wrote a SIAM News article on mixed precision algorithms.
  • I gave a talk at RAIM (Lyon) on precision emulation.

Research

My research concerns the design, development, and analysis of high performance parallel numerical algorithms.

My recent work has particularly focused on accelerating linear algebra computations by harnessing numerical approximations, such as low-rank compression, mixed precision algorithms, and randomization.

Please refer to my publications and talks pages for a list of my recent research activities. You can also check out my Google Scholar profile.

Short bio

• Since Oct. 2026: CNRS research director (DR) in the LIP6 laboratory, PEQUAN team.
• Oct. 2019-Sept. 2026: CNRS researcher (CR) in the LIP6 laboratory, PEQUAN team.
• Jan. 2018-Sept. 2019: postdoc at The University of Manchester in the NLA group.
• Oct. 2014-Dec. 2017: PhD student at University of Toulouse in the IRIT laboratory, APO team.
• Mar. 2014-Sept. 2014: Master student intern at University of Tennessee, Knoxville in the ICL.

Open positions

We have multiple open positions at all levels (Master, PhD, postdoc, and permanent positions) available in our team. Please contact me if you are interested. See in particular here for currently available Master internships, and here for details on PhD and postdoc positions.

Service

• Since January 2026 I am co-director of the GDR C4P (Calcul: Paradigmes, Parallélisme, Performance, Précision) research network. The goal of the GDR is to federate the French research community on Computing: you can register here!
• Since 2026 I am associate editor of ACM Transactions on Mathematical Software (TOMS)

Teaching

• Arithmétique flottante et analyse d'erreur (AFAE, Sorbonne Université): lectures available on Moodle
• Harnessing inexactness in scientific computing (ENS Lyon)

Projects

Current projects

• MUMPS
• FPT4
• NumPEx
• MixHPC

Past projects

• InterFLOP
• SEISCOPE
• ICONIC
• STRUMPACK
• MAGMA

Team

Postdocs

• Liam Burke (LIP6)

PhD students

• Mihai Costin (LIP6)
• Maël Olivier (Inria Bordeaux)
• Giuseppe Carrino (ENS Lyon)
• Alexandre Tabouret (LIP6)
• Ouassel El Habti (EDF-LIP6)
• Karmijn Hoogveld (IRIT)
• Tom Caruso (LJLL)
• Hugo Dorfsman (IFPEN-LIP6)

Past postdocs

• Antoine Jego
• Yongseok Jang

Past PhD students

• Dimitri Lesnoff
• Matthieu Robeyns
• Sébastien Dubois
• Théo Beuzeville
• Matthieu Gerest
• Bastien Vieublé

Past Master students

• Erik Fabrizzi
• Nicolas Catoni
• Roméo Molina
• Atef Dorai

Awards

• Lanczos ECMI/EMS Prize for mathematical software (with P. Amestoy and J.-Y. L'Excellent)
• Médaille de bronze du CNRS 2024
• SIAM Activity Group on Linear Algebra Early Career Prize 2021
• Second Prize for the 20th IMA Leslie Fox Prize
• Honorable mention for the 2020 Householder Prize
• Prix de thèse Gilles Kahn 2018