Henk Visscher (born 1962) was appointed Professor of Housing Quality & Process Innovation in May 2007. His chair is based on process innovations that contribute to ensuring and improving the quality of housing. The most important aspects of this are: usability, health, safety, energy savings and the environmental impact of both existing and new housing. Achieving increased energy savings in the existing housing stock is an area of particular attention. Determining the reasons underlying energy use, such as the properties and quality of the housing and the utility systems, as well as the behaviour and comfort requirements of the residents, are important factors. Policy, regulations and building process innovations aimed at improving the housing stock and making it more sustainable are also addressed.