Born and raised in North Little Rock, Arkansas, Coby moved to Chicago after an internship at the Arkansas Rep and worked extensively in Chicago storefront theater. Then, made his way into Steppenwolf and Goodman Theaters, among others. He was awarded the American Theater Critics' Osborn Award for Best Emerging Playwright for his play Marked Tree, produced by Seanachai Theater. He plays Father Leone in both Man of Steel and Batman v Superman. He also works extensively as a voice over and commercial actor.