Known for his roles in the films Donner Pass, Nesting and Grey Sheep, Stocklin also appeared on The CW's Vampire Diaries, ABC's Mistresses, and CBS's Stalker. In 2016, he began appearing in the Netflix series Haters Back Off.
He earned a bachelor's degree in theatre from Southern Connecticut State University and also trained at New York City's famous Circle in the Square Theatre School.
He performed for five seasons with Milford, Connecticut's Elm Shakespeare Company.
He grew up in Freehold, New Jersey. He began dating his co-star Colleen Ballinger in 2018 and the two became engaged and married all in that same year. They welcomed a son named Flynn together in December 2018. They announced the birth of twins, Wesley Koy and Maisy Joanne, in November 2021.
Beginning in 2014, he and Tara Summers both played recurring roles on Stalkers.