His stories, often involving, sex, drugs, and alcohol, have been compared to those of Jack Kerouac, Ken Kesey, and Charles Bukowski.
Dennis was born in Deer Lodge, Montana, in the infirmary of Montana State Prison.
He was adopted when he was a few days old by Eileen and Elmer Eichhorn, and reared in Boise, Idaho.
Dennis graduated from Boise’s Borah High School in 1963.
He graduated from Boise Junior College (now Boise State University) and played football on athletic scholarships at Whitman College and the University of Idaho; he graduated from the latter with a B.A. in Sociology in 1968.
He didn’t learn he was adopted until he was in his 30s, and never met his birth mother.
Concurrent with his literary work, Eichhorn held a variety of jobs in fields that included hospitality services, driving, social work, and manual labor.
For four years, Dennis also served as promoter and operator of the Blue Mountain Festival, an outdoor music festival held in the spring at the University of Idaho’s Arboretum, and was the primary organizer of the 1971 Universal Life Church Picnic, a large festival held over the Fourth of July weekend in northern Idaho’s Farragut State Park.
He spent time in state prison for selling marijuana and LSD.
Dennis was married three times: to Kip Charlson, Joan Pelley, and Jane Rebelowski.
He had a daughter Sarah (born in 1977), and a grandson Knox (born in 2004). He lived in Bremerton, Washington.
Dennis passed away on October 8, 2015 at age 70.