Marion grew up in Encampment, Wyoming. After receiving his undergraduate degree from the University of Wyoming, Marion spent several years working on the ranch where he was raised. Upon graduating from the University of Wyoming College of Law, Marion joined the Corthell and King team in June 2017.

Marion currently resides in Laramie, Wyoming. When not at work, he enjoys volunteering for Habitat for Humanity and the local Soup Kitchen, working cows, fishing, and building projects in his wood shop.