[1] An important early participant in modernism, Hartmann was a friend of such diverse figures as Walt Whitman, Stéphane Mallarmé and Ezra Pound.
His act involved a device which dispensed perfumes in a manner intended to be analogous to notes in a symphony, which was poorly received by the crowd.
Due to his age and health conditions, Hartmann was one of only a few Japanese Americans on the West Coast to avoid the mass incarceration during World War II, although the FBI and local officials visited the ranch often to conduct investigations.
A collection of his papers is held at the University of California, Riverside, including correspondence related to his obtaining permission to remain in Banning during the war.
[6] Though he was on the outskirts of the movement, he attended anarchist meetings, performed at the New York Ferrer Center, and met with Peter Kropotkin during his visit to the United States.