William L. Sylvester (August 21, 1928 â March 30, 2022) was an American football player and coach and college athletics administrator. He served as the head football coach at Butler University in Indianapolis, Indiana from 1970 to 1984, compiling a record of 84âÂÂ65âÂÂ2. Sylvester was also the athletic director at Butler from 1975 to 1989.