until 1980. In 1977 he received the Secretary of Defense Award for Outstanding Public Service. In 1978 he was appointed chairman of the Department of Energy's Energy Research Advisory Board and served as chairman until 1981 and as a member until 1984. In 1981 he received the Secretary of Energy Award for Exceptional Public Service. He was a consultant to the Office of Science and Technology Policy between 1976 and 1982, during the Carter administration. In 1982 he was appointed chairman of the White House Science Council and served until 1989, during the Reagan administration. From 1990 until 1992, he was a member of President Bush's Council of Advisers on Science and Technology. He advised on technical aspects of defense systems, energy systems, and communications systems, and especially on the resource allocation and technical management issues. He also served on boards, too numerous to cite here, of U.S. national laboratories and universities. Sol was a member of the Council of the National Academy of Engineering between 1980 and 1986 and a member of its Executive Committee from 1984 to 1986. He also chaired the NAE's Nominating Committee in 1986 and 1987.

Sol was a very effective participant on each of the boards and committees on which he served. He will be greatly missed by his many friends.