However, he persuaded John Cockcroft, a member of the United Kingdom Atomic Energy Authority, to suggest who might be invited to the 1958 conference. He successfully resisted a subsequent attempt to take over the conferences, causing a Foreign Office official to write that "the difficulty is to get Prof. Rotblat to pay any attention to what we think ... He is no doubt jealous of his independence and scientific integrity", and that securing "a new organizer for the British delegation seems to be the first need, but I do not know if there is any hope of this." By the early 1960s the Ministry of Defence thought that the Pugwash Conferences were "now a very respectable organization", and the Foreign Office stated that it had "official blessing" and that any breakthrough may well originate at such gatherings. The Pugwash Conferences are credited with laying the ground work for the Partial Test Ban Treaty of 1963, the Nonproliferation Treaty of 1968, the Anti-Ballistic Missile Treaty of 1972, the Biological Weapons Convention of 1972 and the Chemical Weapons Convention of 1993. In parallel with the Pugwash Conferences, he joined with Albert Einstein, Robert Oppenheimer, Bertrand Russell and other concerned scientists to found the World Academy of Art and Science, which was proposed by them in the mid-1950s and formally constituted in 1960.