Piotr Magnuszewski works on the question of what makes things complex and how to understand and manage this complexity. he has been working for decades as a systems modeler, game designer, professional trainer, facilitator, and researcher to provide tools for people in all sectors to make better policies and decisions about the society and environment. He designed and applied many social simulations and role-playing games addressing the issues of resilience and sustainability such as climate change, energy transition, management of natural resources. The tools the designed and applied enable more effective collaboration for groups and organisations. Piotr has been working with diverver groups of scientists, businesses, NGOs and international organisations including the European Commission, OECD, African Development Bank and the Zambezi Watercourse Commission. Piotr works as a research scholar at the International Institute for Applied Systems Analysis (Austria). He is also co-founder and managing director of the Centre for Systems Solutions (Poland). He is an author of many research and educational publications.