I am an associate professor at the University of Namur (department of Mathematics) and currently director of the Namur institute for Complex Systems (naXys). I received the M.S. degree in aerospace engineering and the Ph.D. degree in applied mathematics from the University of Liège, Belgium, in 2007 and 2011, respectively. Prior to joining UNamur, I was a postdoctoral researcher at the University of California Santa Barbara from 2011 to 2013, at the University of Liège from 2013 to 2015, and at the University of Luxembourg in 2016.
My research lies at the intersection of dynamical systems theory, control theory, and operator theory (Koopman operator). It aims at developing new theoretical approaches and numerical tools that are needed for the global analysis of nonlinear systems and networks.
3/2026: I am visiting Y. Susuki's group at Kyoto University and attending the workshop "Perspectives and Applications of Koopman Operator Theory" organized by R. Muolo at the RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences.
3/2026: FG and Judicaël got two papers accepted at ECC2026, on kernel methods for Koopman-based stability and a density-based approach to the dual Koopman observer.
2/2026: a book chapter on "An Overview on Stability Theory in a Koopman Operator-Theoretic Perspective" is available online.
1/2026: a paper co-authored with I. Mezic on analytic EDMD is accepted in SIAM Journal on Applied Dynamical Systems [arxiv]
10/2025: Judicaël presented his research on Koopman-based state estimation at the NOLTA conference in Okinawa, Japan.
9/2025: I gave a plenary talk at the SOCN study day in Mons
9/2025: I attended the excellent 2nd workshop on "Koopman Operator Theory: Fundamentals, Approximations and Applications" in Cres (Croatia), sponsored by the University of Rijeka (Faculty of Engineering) and the Moise Palace.
6/2025: Natsuki Katayama (Kyoto University, supervisor: Yoshihiko Susuki) is visiting for one month in the context of a FNRS-JSPS mobility project with Japan.
6/2025: a paper co-authored with Ramachandran Chittur Anatharaman on Koopman operator based network identification is accepted in Nonlinear Dynamics [arxiv]
5/2025: I attended the next SIAM Conference on Applications of Dynamical Systems in Denver. A mini-symposium on the Koopman operator in control will be co-organized with Cindy Yee (University of Colorado Colorado Springs)
3/2025: a paper co-authored with Rishikesh Yadav on Koopman operator approximation via Bernstein polynomials is accepted in Communications in Nonlinear Science and Numerical Simulation [arxiv]
3/2025: FG got a paper accepted at ECC25, on error bounds on analytic Koopman-based Lyapunov functions