I have been member of the board of the  International Society for Analysis, its Applications and Computation (ISAAC) since 2016. See

http://www.isaacmath.org/home/

I have been member of the executive committee of the International Association for Generalized Functions (IAGF) since 2016. See:

https://iagf.pmf.uns.ac.rs/executive-comittee/

From 2014 to 2021, I was board member of the Belgian Mathematical Society. I was also Steering committe member of this society during 2014-2016.