After completing his terminal degree, Dr. Greer spent three years teaching on U.S. military bases across Italy, Spain, and Germany through the University of Maryland. He has since brought his expertise to state universities and community colleges in Virginia and California, where he taught various history courses. At TMU, Dr. Greer specializes in California History, U.S. Diplomatic History, and advanced 20th-century U.S. and European History courses. He and his wife, Bonnie—who teaches Italian part-time at TMU—reside in the serene mountains of the Frazier Park area.