President during signing of SALT 1?

The negotiations known as Strategic Arms Limitation Talks began in November 1969 and ended in January 1972, with agreement on two documents: the Anti-Ballistic Missile Treaty (ABM Treaty) and the Interim Agreement on the Limitation of Strategic Offensive Arms. Both were signed on May 26, 1972.

The president in 1972 was:

Richard M. Nixon - 1913-1994

37th President (1969-1974), 36th Vice President (1953-1961)

Source

http://www.atomicarchive.com/Treaties/Treaty8.shtml

http://www.geocities.com/peterroberts.geo/Relig-Politics/RMNixon.html