Here is the list of the PhD students I have supervised:
Andersen M.S. Ang (Assistant Professor, U. of Southampton), "Nonnegative Matrix and Tensor Factorizations: Models, Algorithms and Applications", 2020. [thesis]
Valentin Leplat (Assistant Professor, Innopolis University), co-supervisor: Xavier Siebert, "Nonnegative Matrix Factorization - Models, Optimization Problems, Algorithms and Applications", 2021. [thesis]
Nicolas² Nadisic (Assistant Professor, UGent & KIK-IRPA), co-supervisor: Arnaud Vandaele, "Sparsity and Nonnegativity in Least Squares Problems and Matrix Factorizations", 2022. [thesis]
Pierre De Handschutter (CETIC, Lecturer @ UMons), co-supervisor: Xavier Siebert, "Multilayer and deep matrix factorizations", 2023. [thesis]
Olivier Vu Thanh (Postdocoral researcher), co-supervisor: Fabian Lecron, "Low-Rank Matrix Factorizations with Volume-based Constraints and Regularizations" 2024. [thesis]
Hazan Daglayan (Researcher, VITO), supervisor: P.-A. Absil, "Low-rank techniques for exoplanet detection in high contrast images", 2025. [thesis]
See also the Math Genealogy Project.