BioStefan Blumentrath holds a Ph.D. in environmental planning from the Gottfried Wilhelm Leibniz University of Hannover and a Master degree in environmental planning from the Gottfried Wilhelm Leibniz University of Hannover. He has more than 10 years’ experience from spatial analysis and modeling within the fields of ecology and environmental planning. Being an environmental planner, Stefan has a strong background in mapping- and valuation-methods used for environmental and spatial planning purposes, with a special focus on computer aided methods. In this context he also works on remote sensing for mapping ecosystem characteristics. Stefan is an active member of the OSGeo community and contributes to the development of Open Source Geospatial Software, mainly with addon functionality to the GRASS GIS and QGIS project.