James Cadbury "was on the staff of the Royal Society for the Protection of Birds (RSPB) from 1969–2000, first as Head of Research and then as Senior Ecologist. He continues to work on a contract basis with the Society. As a member of the Reserves Ecology team, he was involved in providing scientific advice for the management of RSPB reserves. From 1987-1998, James was editor of RSPB Conservation Review.
"As an active field botanist, he has contributed to the recording of the flora of Cambridgeshire, the Norfolk Broads, Tiree, Shetland, and particularly RSPB reserves throughout the UK. James has an extensive knowledge of the vascular plant flora in Europe and the Seychelles. For several years, James was a member of the Council of the Botanical Society of the British Isles.
"He is a vice-president of the Cambridgeshire Bird Club and a member of the English Nature Management Committee for Wood Welton Fen, the National Trust Local Management Committee for Wicken Fen and the Devon Wildlife Trust Management Committee for Welcombe and Marsland reserves. He is a Trustee of the Kingfishers Bridge Wetland Creation Trust (Cambridgeshire). In the Seychelles, he is Chairman of the Island Conservation Society's Scientific Committee for Aride Island." 
- Trustee, Plantlife International