Steven van Rossum chose after his study Social Geography in Utrecht, entrepreneurial freedom and worked for various commercial and public organizations as an interim manager. In 2007 he joined Waternet as an interim manager. In 2014 he joined the board of Directors of Waternet as Programme director, and in 2016 he became CEO of World Waternet. World Waternet is a non-profit organization, dedicated to improving sustainable access to clean, sufficient and safe water for all.
In 2020 Steven van Rossum chose to be active as an interim-manager again and was asked by the Ministry of Economic affairs and the Topsector Water & Maritime to develop a strategy to enlarge the export of the Dutch Water technology sector. This resulted in the programme called WTEX10 – Accelerating Dutch Water Technology Export which is currently being executed under his supervision together with the Netherlands Water Partnership (NWP) and Water Alliance. In 2021 he was appointed as Chair of the steering committee of the YEP programme, The main goal of the programme is to offer young Dutch professionals the opportunity to gain experience abroad and to offer young local professionals the opportunity to gain experience with working in the field of Water, Agrofood and renewable Energy in an international environment through Dutch organisations.