Prof. Dr. Hartmut Balder: Head of the Institute for Urban Greenery in Falkensee since 2010. Emeritus Professor at the Technische Hochschule Berlin, Faculty V - Life Sciences and Technology. Habilitated at the Leibniz University of Hanover. Advised on the concept of the 2017 White Paper on Urban Greenery. Columnist for the trade journal “Pro Baum”.