Pugwash Conferences on Science and World Affairs
He caused some surprise by leaving academia and becoming director of the National Museum of Wales in 1968, holding the post until 1977. He also served as chairman of the Welsh Academy, as a governor of the Commonwealth Institute, a member of the Atomic Scientists Association (of which he was a co-founder) and a member of the Pugwash Conferences on Science and World Affairs. He was awarded a CBE in 1978 for his service to Wales. He died on 3 July 2006.