When you think of Louis Kahn, the first thing that comes to mind is the Kimbell Art Museum, the Salk Institute for Biological Studies, and other neat concrete buildings. However, on the other hand, it is not well known that Khan has been working hard on housing design since he was a young draftsman in his twenties, and has worked on nearly 50 housing projects, including draft plans. He had 20 private residences, 9 of which were built. Until he died in 1974, Khan is said to have never refused a housing job, no matter how big a project he had or how busy he was. What was housing for Louis Kahn? That question was the impetus for creating this book. I visited all of Kahn's surviving homes, photographed them, spoke with their owners, and examined drawings at his alma mater, the University of Pennsylvania. What became apparent was that residential design was the starting point for Kahn's design approach and the foundation of all his work. This book introduces all the houses in his later years, starting with his first private house in 1940. Looking through his design approach to homes over the last 30 years, I feel like I've just completed my journey through Kahn.