Brennan is a 2012 graduate of Grace Community School and earned his bachelor’s degree in mechanical engineering from the United States Air Force Academy. Brennan served on active duty in the Air Force for five years and had the opportunity to work as an engineer and program manager at the AF Research Laboratory, a small-business liaison, and STEM outreach coordinator. A passion for education pushed him to switch careers, and thus he joined the GCS team in 2021 to teach mathematics and engineering. Brennan also earned a master’s degree in education from Wayland Baptist University.