Born: July 11, 1848, New Pennsylvania, Ohio.
Died: November 16, 1923, East Cleveland, Ohio.
Buried: Westwood Cemetery, Oberlin, Ohio.
John was the husband of Emma Horning.
He taught violin, cornet, horn, trombone, oboe, and clarinet at the Oberlin College Conservatory of Music, 1889–1919.
If you know where to get a good photo of Demuth (head & shoulders, at least 200×300 pixels),