The Society had collected photographs and items of historical importance on an ad hoc basis, particularly from the 1890s. With the appointment of John Dudley Johnston as Honorary Curator, a post he held from 1924 to 1955, a more proactove approach was taken to collecting. Before Johnston's appointment the collection had concentrated on technical advances of photography, and he began add pictorial photography to the holdings. On Johnston's death in 1955 the role of Honorary Curator was taken over by his wife Florence and a succession of paid and unpaid staff, with Professor Margaret Harker as Honorary Curator over a long period. The collection was moved to the National Museum of Photography, Film, and Television at Bradford (later the National Media Museum) in 2002; the move was supported by the Head of the museum, Amanda Nevill, who had been the society's secretary in the 1990s.