Alexander Koch is an American actor. His Hollywood career started in the 2010s. His debut was in the short films Winter and Ghosts. He then made his first television appearance as an extra in the show Underemployed. Afterward, he got his first starring role as James “Junior” Rennie in the television series Under the Dome. He was part of the show’s main cast from its first to the third season. This gained him substantial attention among television viewers. After it ended in 2015, he made his big screen debut in the feature film Always Shine. Last year, he appeared in the music video for the song “Issues”.