He enrolled at the James Millikin University in the fall of 1915 and graduated with a Bachelor of Arts degree in 1919, having majored in biology and minored in mathematics.
[2] Harry began his coaching career at Prairie View A&M University in 1919 and then coached at Langston University in Oklahoma in 1922 before taking over at Paul Quinn College in 1923 when his brother Fred left Paul Quinn for Wiley College.
In 1924 Paul Quinn tied Tuskegee, 0–0, and earned a share of the black college football national championship.
[3] On December 8, 1945, as the Wiley Wildcats were playing Florida A&M in the Orange Blossom Classic in Tampa, Florida for the black college football national championship Long, who was still an assistant coach on his brother's staff, suffered a fatal heart attack on the sidelines during the first quarter of the game and died.
This biographical article relating to a college football coach first appointed in the 1920s is a stub.