Founded in 1853 the RPS is one of the oldest photographic societies in the world.
In 1991 David became a Fellow of the Society (FRPS) after submitting two panels of images of African wildlife.
Both were accepted. http://www.rps.org/
This is the trade association for picture libraries in the UK.
For many years, whilst running his Stock Library Images of Africa Photobank, David was a member of BAPLA.
Alamy, who market his images nowadays are members. http://www.bapla.org.uk/