Career
He served as the head football coach at the University of Colorado at Boulder in 1900 and at Alma College in 1901, compiling a career college football record of 9–6. Mortimer was also the head baseball coach at Colorado in 1900, tallying a mark of 4–2. Mortimer graduated from Simpson College in 1896 and played football as a tackle at the University of Chicago from 1896 to 1899.
