Peter Steen Mikkelsen is Professor of urban water systems at the Department of Environmental Enineering (DTU Environment), Technical University of Denmark. The main scientific interests are related to integrated understanding, engineering and management of Urban Water Systems with emphasis on stormwater management and urban drainage, fate of micropollutants and cloudburst management, and the role of uncertainty in modelling and decision making. Peter has been a visiting scientist at the Swiss Federal Institute for Environmental Science and Technology in Zürich (ETH/EAWAG, 1993-94) and at the Centre for Water Sensitive Cities at Monash University, Melbourne, Australia (2010-11). He has published more than 300 publications including 95 international, peer reviewed scientific papers and 4 national best practice standards. He is Head of Water DTU, the Center for Water Activities at DTU.