However, in December 1959 Marvin Stern, Charles H. Townes, Keith Brueckner, Kenneth Watson, and Marvin Leonard Goldberger met in Los Alamos where several of them had been working on nuclear-rocket research and launched JASON as an ongoing summer study program, with financial and administrative support supplied by the Institute for Defense Analyses. In the early 1960s, JASON had about 20 members. By the end of the decade it had grown to over 40 members, with close ties to the President's Science Advisory Committee. In the early 1970s the backing institution for JASON was changed from IDA to SRI.