In May 1987, Ride announced that she was leaving NASA to take up a two-year fellowship at the Stanford University Center for International Security and Arms Control (CISAC), commencing on August 15, 1987. She divorced Hawley in June. At Stanford, her colleagues included Condoleezza Rice, a specialist on the Soviet Union. Ride researched means by which nuclear warheads could be counted and verified from space, but the impending end of the Cold War made this a much less pressing issue. As the end of her fellowship approached, Ride hoped to secure a permanent position at Stanford. Sidney Drell, who had recruited her, attempted to get a department to appoint her as a professor, but none would. Drell resigned from CISAC in protest.