Wylie, known as "Cas", was educated at Baltimore City College form 1909 to 1911. He continued his education at the University of Maryland, receiving an LLD. degree in 1914 from the University of Maryland Law School.
Cas played lacrosse while at City College for three years, captaining the championship team in his senior year, 1911. Cas organized, played for and captained the Walbrook Athletic Club team in 1912, 1913, and 1914. Transferring to the Mt. Washington Club team, he played in 1915 and 1916 and again from 1920-1927, and captained the Mt. Washington Team in 1922.
During his playing days, Cas was known as one of the finest lacrosse players in the country. In 1926, he was the first lacrosse player ever to be awarded the Evening Sun Medal for his outstanding record as a player and his brilliant work throughout the country in serving lacrosse as president of the USILA.
Cas was one of the original men to help organize and start lacrosse at the University of Maryland. He officiated from 1922-1936 and was considered one of the best officials in the game.
In 1927, Cas made a trip to Europe to arrange for a lacrosse team to participate in the 1928 Olympics at Amsterdam. He was elected vice president of the International Federation of Amateur Lacrosse the same year. His administrative duties in lacrosse included being vice president of the USILA in 1925, president in 1926 and 1927, executive board in 1926-1929 and serving on the ranking committee from 1928-1930. He served on the Olympic Committee in 1930 and on the playoff committee for the Olympics in 1932.
Cas Wylie passed away in 1949.