A 2004 graduate of Concordia, Sean Gibson return to CLHS in 2016 to teach after having worked as a social studies teacher at Horizon Christian Academy. He held that position since 2014. Before then, he worked as a substitute teacher. He also worked as a swim coach, most recently at Carroll High School and Arlington Park. He also has been the youth director at his church for five years. He holds a bachelor’s degree in secondary social studies education from Indiana University.