He was the fifth head football coach at the Southwestern College in Winfield, Kansas, serving for five years, from 1909 to 1913, and compiling a record of 24–11–6.
[1] Clapp was also the also the head basketball coach at Southwestern and was the second person on record to hold that post.
[2] Clapp attended Southwestern College, where played football and competed on the track team.
[4] Clapp earned a master's degree in physical education from the University of Southern California (USC).
He taught physical education of Chaffey High School in Ontario, California for 41 years.