Erik is a complex systems modeller and co-founder of the PEAS Center. His focus is on solving complex dynamic issues for governments, European institutions, and NGOs by means of data-rich multi-scale systems modelling and simulation under deep uncertainty. His work includes simulation models for complex issues such as the world energy system, geopolitics, public health, migration, and asylum systems. He co-developed methods for dealing with large amounts of data, Deep Uncertainty, multi-scale complexity, taught System Dynamics modelling, and developed books and materials to teach complex systems modelling and simulation to all.