Biography of the South African born scientist and policy adviser (to British and American governments!). Biologists and conservationists remember him particularly for his involvement with London Zoo and as the inspiration for the school of environmental science at the University of East Anglia. 'No scientist this century can match [his] influence on governments in peace or war. Embraced by the Establishment, he could stand aloof from it and be its severest critic.' Lord Dainton