Morrill also served as an executive and head of official for the United States Intercollegiate Lacrosse Association.
He went on to college at Johns Hopkins University where he starred in lacrosse from 1925 to 1927 and his teams won two national titles.
After his coaching tenure at Hopkins, Morrill remained active in the sport of lacrosse serving in an various administrative and rule-setting capacities.
Additional information needed The William Kelso Morrill Award for Excellence in Mathematics was established at Hopkins in 1995 in his honor.
[2] Morrill's son, William K. Morrill Jr. followed in his father's footsteps both as a star player at Johns Hopkins and as a National Lacrosse Hall of Fame inductee, graduated as Hopkins' all-time leading goal scorer and point scorer.