Evans, known as 'Moon' to all his friends and admirers, attended the Business High School in Washington, D.C., graduating in 1926. He entered the University of Maryland, graduating with an BA degree in 1930, then attended George Washington University for graduate work, receiving his LLB degree in 1934. Moon won freshman letters in football, basketball, and lacrosse, going on from there to win three varsity letters in the same sport, and when he graduated in 1930, he won all of Maryland's best athlete awards, both for ability and leadership. In 1929, Moon was selected All-Maryland quarterback, All-Southern quarterback, and All-American quarterback. He was captain of basketball in 1929-30 season.
His lacrosse honors were only the highest. Moon was selected as a first team All-American in 1929 and 1930. He was called the best all-around lacrosse player in the country, and in some cases, called the best player of the decade. He led the country in scoring in both his junior and senior years. He played with the U.S. All-Star lacrosse team against Canada, led the scorers in this all-star series, and was voted the most valuable player.
Moon played in the Box Lacrosse League for Baltimore in 1932. His team went undefeated, and he was the high scorer. Moon practiced law in Rockville, Maryland from 1935 until his death. He enlisted in the U.S. Marine Corps in 1942, resigned as a captain in 1945, having served in action at Pelilue and Okinawa. He received a Pacific Award Commendation Badge.
Bill "Moon" Evans passed away in 1963.