LTC Regan holds a B.A, and an M.A. in History from the University of Missouri -St. Louis. He served in the United States Army and Army Reserve from 1975 till 1996. He has served in Infantry, Special Operations and Military Intelligence units. He has served in staff positions at the tactical, theater and national level. Upon retirement from the Military he taught American History at San Antonio College and Our Lady of the Lake University. He has worked as an Alamo docent and spoken on Texas history to numerous groups in San Antonio, Texas.