Shelly Guzman and Justin Johnson are engaged to be married in September.The couple met while living in Seattle.The bride-to-be is the daughter of Gardnerville residents Juan Guzman and Teri Jamin. She is pursuing a master of science in sport nutrition from University of Colorado at Colorado Springs, and works as a registered dietitian.The groom-to-be is the son of Ron and Marcia Johnson of Americus, Kan. He is a graduate from Missouri State University, and works as a physical therapist. …