Marsh is an educator, author, artist, videographer, photographer, and digital content creator.
He has worked mostly in the non-profit arena, specializing in public education, community outreach, and conservation. The Arizona-Sonora Desert Museum, Humane Society of Southern Arizona, and the Oregon Coast Aquarium are among some of the prestigious organizations he's worked for during his career.
Marsh is also the author of the young adult novels HIS LIFE ABIDING (2013), THE MEN IN THE TREES (2014) and MY SUMMER (WITH ROBOTS) (2018), and MY SUMMER (UNDER A CRESCENT MOON) (2021). He acted as editor and publisher for the historical memoir THE RIVER YEARS: A MEMOIR FROM THE MUDDY BANKS OF LEE'S FERRY, which was written by his mother, Dawn. His current work-in-progress is MY SUMMER (AND THE SONG OF CICADAS) which will be published in 2023.