Born in Carroll, Iowa, Riesenberg moved to Moscow, Idaho, before his freshman year of high school. At Moscow High School, he was an all-state football player for the Bears on both offense and defense, an all-state basketball player, and a three-time state champion in the discus.
His father, Louis, a professor at the University of Idaho since 1979, was the chairman of the agricultural education department.
Riesenberg later attended Oregon State University in Corvallis to complete his engineering and education studies in 2005. He coached offensive line at Redwood High School (Larkspur) (helping the Giants to win MCAL titles in 1998 and 2000, also serving as the offensive coordinator for the latter) for four years at Corvallis High School, and two years at Philomath High School. Riesenberg is now a math teacher and offensive line coach at Crescent Valley High School in Corvallis.