Thomas Gordon Cullen (9 August 1914 – 11 August 1994) was an influential British architect and urban designer who was a key motivator in the Townscape movement. Cullen presented a new theory and methodology for urban visual analysis and design based on the psychology of perception, such as the human need for visual stimulation and the notions of time and space.[1] He is best known for the book Townscape, first published in 1961.[2] Later editions of Townscape were published under the title The Concise Townscape.[3]