From 1885 to 1900, he was Professor of History, Latin and Elocution at Claverack College where his pupil Stephen Crane heard Van Petten's Civil War reminiscences which became the base for The Red Badge of Courage.
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Stephen Crane is known to have interviewed veterans of 124th while researching his book The Red Badge of Courage, commonly held to depict a fictionalized version of the Battle of Chancellorsville, and is thought to have based some experiences in the book on their testimony.
For Fawcett Comics, he did work in Hot Rod Comics, an adaptation of the 1951 John Huston film The Red Badge of Courage and "a couple of Westerns", including the movie spin-off feature "Lash LaRue".