When was the Rob Renzetti the supervising producer for Gravity Falls?
Rob Renzetti:  He has also served as story editor for the first two seasons of "", and was supervising producer on the Disney Channel animated series "Gravity Falls". Gravity Falls: Gravity Falls is an American animated television series produced by Disney Television Animation originally for Disney Channel (and then later for Disney XD) from June 15, 2012 to February 15, 2016.
June 15, 2012 to February 15, 2016