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".
Steven Engel Steven Andrew Engel is an American lawyer who is the nominee to become United States Assistant Attorney General for the Office of Legal Counsel in the Donald Trump administration. Engel, who previously worked in the George W. Bush administration as deputy assistant attorney general in the Office of Legal Counsel, was nominated by President Donald Trump on January 31, 2017. A graduate of Yale Law School, Engel clerked for U.S. Supreme Court Justice Anthony Kennedy. He practiced law at Kirkland & Ellis before becoming a partner at the Dechert law firm.