In 2005, he opened Blackwatch Studios with co-owner Jarod Evans and produced his first full-length album, I Am Haunted, I Am Alive by Beau Jenning's project Cheyenne.

Copelin was nominated at the 2017 Grammy Awards for Best Contemporary Christian Album for his work on "Poets & Saints" by All Sons & Daughters.

[2] Copelin began to garner attention from a diverse mix of musicians and has since gone on to engineer music for pop artists Christina Perri, Avril Lavigne, Train,[3] Kelly Clarkson, and Third Eye Blind, as well as produce and engineer indie artists such as Sufjan Stevens, Ben Rector, Ivan & Alyosha,[4] Bronze Radio Return, Emily Hearn, BRONCHO, and Other Lives, among others.

[5] Copelin's most recent projects include engineering Sufjan Steven's album, Carrie and Lowell, along with recording and producing Broncho's Just Enough Hip to Be a Woman and Ivan & Alyosha's It's All Just Pretend.

Copelin has also been working on new projects with Broncho, Riah, Ben Rector, Bronze Radio Return, Sports and Andrew Belle.