Marten Scheffer is a Distinguished Professor at the department of Aquatic Ecology and Water Quality Management at Wageningen University in the Netherlands. He is an ecologist, mathematical biologist. He was a winner of the 2009 Spinoza Prize. His research focuses on unravelling the mechanisms that determine the stability and resilience of complex systems. Although much of his work has focused on ecosystems, he also worked with a range of scientists from other disciplines to address issues of stability and shifts in natural and social systems. Examples include the feedback between atmospheric carbon and the earth temperature, the collapse of ancient societies, inertia and shifts in public opinion, evolutionary emergence of patterns of species similarity, the effect of climatic extremes on forest dynamics and the balance of facilitation and competition in plant communities. With the help of a Spinoza award and an ERC advanced grant he founded SparcS and now works on finding generic early warning signals for critical transitions. He also co-founded the ‘South American Institute for Resilience and Sustainability Studies’ SARAS.