Research interests: Low-rank matrix approximations, nonnegative matrix factorization, continuous and discrete optimization, numerical linear algebra, computational complexity, machine learning, data mining, hyperspectral imaging, signal processing. 

My code and publication pages are experiencing some problems. For my plublictions, see Google scholar, Scopus, arXiv, ORCID, and the UMONS website with the PDFs. For the recent codes; see https://gitlab.com/ngillis/ and the links within the papers. 

*News*

• Olivier Vu Thanh [thesis] and Hazan Daglayan [thesis] have successfully defended their PhD (October 24 & January 25). Congratulations to them! 

• My book on NMF is available online.  The Matlab code of the book is available on gitlab. A course on NMF (slides + exercices) is available from here. 

*Where I'll be at ?*

• We organize the third workshop on Low-Rank Models and Applications (LRMA 25), 11-12 September 2025, in Mons. All information can be found on the website https://sites.google.com/view/lrma25

• Organization of the SOCN study day, 26 September 2025, Mons.