sentences:  In this latter capacity, he was responsible for final preparation of the START I Treaty, signed by Presidents Bush and Gorbachev in Moscow on July 31, 1991.In December 1992, he performed a similar function during the final preparation of the January 3, 1993, START II Treaty.Brooks was sworn in as Under Secretary of Energy for Nuclear Security/Administrator of the National Nuclear Security Administration (NNSA) on May 16, 2003.