Evan L. Schwab  served as law clerk to a US Supreme Court Justice that was nominated by which president?
William O. Douglas William Orville Douglas (October 16, 1898January 19, 1980) was an American jurist and politician who served as an Associate Justice of the Supreme Court of the United States. Nominated by President Franklin D. Roosevelt, Douglas was confirmed at the age of 40, one of the youngest justices appointed to the court. His term, lasting 36 years and 211 days (1939–75), is the longest in the history of the Supreme Court. In 1975 "Time" magazine called Douglas "the most doctrinaire and committed civil libertarian ever to sit on the court".
Rex E. Lee Rex Edwin Lee (February 27, 1935 – March 11, 1996) was an American lawyer, law clerk for former U.S. Supreme Court Justice Byron White, and the United States Solicitor General during the Reagan administration. He argued 59 cases before the U.S. Supreme Court. A member of The Church of Jesus Christ of Latter-day Saints (LDS Church), Lee was an alumnus and the tenth president of Brigham Young University (BYU). Lee was a first cousin of Mo Udall and Stewart Udall.