is considered a pioneer, making candid unposed photographs of people in London and at the seaside in the late 19th and early 20th century in order to record life. Martin is the first recorded photographer to do so in London with a disguised camera. Mass-Observation was a social research organisation founded in 1937 which aimed to record everyday life in Britain and to record the reactions of the 'man-in-the-street' to King Edward VIII's abdication in 1936 to marry divorcée Wallis Simpson, and the succession of George VI. Humphrey Spender made photographs on the streets of the northern English industrial town of Bolton, identified for the project's publications as "Yorktown", while filmmaker Humphrey Jennings made a cinematic record in London for a parallel branch of investigation. The chief Mass-Observationists were anthropologist Tom Harrisson in Bolton and poet Charles Madge in London, and their first report was produced as the book "May the Twelfth: Mass-Observation Day-Surveys 1937 by over two hundred observers" France The post-war French Humanist School photographers found their subjects on the street or in the bistro. They worked primarily in black‐and‐white in available light with the popular small cameras of the day, discovering what the writer Pierre Mac Orlan (1882–1970) called the "fantastique social de la rue" (social fantastic of the street) and their style of image-making rendered romantic and poetic the way of life of ordinary European people, particularly in Paris. Between 1946 and 1957 Le Groupe des XV annually exhibited work of this kind. Street photography formed the major content of two exhibitions at the Museum of Modern Art (MoMA) in New York curated by Edward Steichen, Five French Photographers: Brassai; Cartier-Bresson, Doisneau, Ronis, Izis in 1951 to 1952, and Post-war European Photography in 1953, which exported the concept of street photography internationally. Steichen drew on large numbers of European humanist and American humanistic photographs for his 1955 exhibition The Family of Man, proclaimed as a compassionate portrayal of a global family, which toured the world, inspiring photographers in the depiction of everyday life. Henri Cartier-Bresson's widely admired Images à la Sauvette (1952) (the English-language edition was titled The Decisive Moment) promoted the idea of taking a picture at what he termed the "decisive moment"; "when form and content, vision and composition merged into a transcendent whole". His book inspired successive generations of photographers to make candid photographs in public places before this approach per se came