As a Principal Scientist in TNO I shape the cooperation between TNO, industry and academic partners to identify and solve system transitions. My technology background is mechanical engineering, materials science and complexity science. The critical system transitions for me are the highly related energy transition (sustainable energy) and material transition (aka circular economy). In these areas I am the content manager for a number of programs and projects on e.g. logistics, sustainable business models and closing loops while I coordinate the route Circular Economy and Resource Efficiency as part of the Netherlands National Science Agenda.