Dennis was born January 14, 1949, to Hubert Gundermann and Lorraine French.
Dennis graduated from Opheim High School and then went to the College of Great Falls and received a degree in Economics and Accounting.
Dennis was the father of four children, Arliss, Neal, Mara and Joshua.
He was preceded in death by his father Hubert and a son Neal.
Dennis has three grandchildren: Tyler, Tova and Snow.
No Memorial services are planned.