Louis Kahn (1901-1974) a practitioner of international modernism sought the spiritual in his powerful forms & encouraged his students to seek the essential nature of architecture His Philadelphia-based practice was responsible for the Richards Medical Research building in Philadelphia Pennsylvania the Yale Art Gallery extension in New Haven the Kimbell Art Museum in Fort Worth & more An essay by Kahn on his sources of inspiration is included as well as an interview with the architect on his working methods & his vision for the future of the profession