Dirk Sijmons (1949), landscape architect, studied at TU Delft. From 1977 to 1981 he worked for the nature conservation directorate of the then Ministry of CRM. From 1981 to 1984 he was head of the Department of Strategic Policy Development and Research Coordination at the then Ministry of Agriculture, Nature Management and Fisheries. He then joined the Forestry Commission as head of the Landscape Architecture department (1984-1990). He is coordinator of the landscape architecture course of the Academy of Architecture in Amsterdam from 1990-1994. In 1990 he is one of the three founders of H+N+S Landscape Architects. In recent years, Dirk has been associated with H+N+S as a consultant for projects such as the Eo Wijers competition and the IABR 2016 project '2050 An Energetic Odyssey'.