Wolfgang Ansel is a biologist and Director of the International Green Roof Association (IGRA). He is co-author of various books on Green Roofs, and has been a frequent speaker at congresses in Europe, North America and Asia over recent years. IGRA’s targets include the worldwide promotion of the ecological Green Roof idea, international knowledge transfer in the field of Green Roofs and the stimulation of international standards for good practice and reliable Green Roof technology. One of IGRA’s main areas of work is implementing Green Roof policies at an international level. Together with the City of Portland (Environmental Services) and the International Federation of Landscape Architects (IFLA), IGRA has created a platform to facilitate the application of Green Roof policies, the “International Green Roof City Network”.