On 4 October 2019, COST Action Mathematical models for interacting dynamics on networks MAT-DYN-NET ran its first kick-off meeting in Brussels at COST (European Cooperation in Science and Technology). MAT-DYN-NET is a newly funded research network within Horizon 2020 COST Programme that will link leading experts working on mathematical models for dynamical systems on networks (DSN) and address research challenges of complex networks at a European level.