Posch is a lifelong St. Cloud area resident and baseball fan. He grew up in rural Rice and attended Sauk Rapids High School. Gary later studied at St. Cloud Technical & Community College, where he received an Associate Degree in Sales Management Marketing. Teaming up with Joe Sexton, his longtime Rox Baseball Club partner, they together purchased and operated the Brandl Companies, which has now grown to include Brandl Motors of Little Falls; Brandl Auto Connection in St. Cloud; Brandl Mobility Finance in St. Cloud and Brandl Chevrolet Buick GMC in Aitkin. Before acquiring the Rox in 2012, Posch first got his taste of the Northwoods League two years prior when he was one of the founding partners of the Willmar Stingers franchise. Gary is very involved in many area civic groups and community functions in addition to serving on the Board of Directors for the Rox Community Foundation, a 501(c)(3) charitable foundation which provides grants, donations, and scholarships in support of youth-related programs and activities involving Sports, Arts, Volunteerism and Education initiatives in Central Minnesota. He is also a past Board member of the SCTCC. Gary and his wife, Meredith, currently reside in Sauk Rapids and are the parents of three children: Daughter Mackenzie and Sons Brady & Cullen.