Since my graduation in the roaring seventies I was interested in dwelling architecture and the architecture of the city. From 1988 until 1990 I worked together with Rem Koolhaas who was a guest professor at that time. Since fifteen years I am focussing on research. So I am writing a lot of texts and books like Design and analysis, The IJ-plein book. Together with Jasper van Zwol, René Heijne and Birgit Jürgenhake we made the book “Time Based Architecture”, a book about the influence of changes in program and lifestyle on the design of buildings.