Education
A native of Ann Arbor, Michigan, Duffy attended Ann Arbor High School.
A native of Ann Arbor, Michigan, Duffy attended Ann Arbor High School.
He served as the head coach at Alma College in 1895 and as an assistant coach at the University of Michigan in 1897. He played college football for one season at Michigan. He attended college at the University of Michigan.
In 1895, while a student at Michigan, Duffy served as the head football coach for Alma College in Alma, Michigan.
His coaching record at Alma was 3 wins and 1 losses. He played on the football team as a fullback in 1896.
In 1897, he served as an assistant coach for the Michigan football team He spent only "a short time in college".
In 1902, Duffy was working as an electrician.
Duffy was a member of the Alpha Epsilon fraternity.