 He became an assistant professor of Military Science at California State University from July 1994 until July 1997.Simultaneously, Borja taught in the classroom at Marianas High School in Saipan from August 1994 until July 1995, and returned to the faculty of the school for a second time from September 1996 until July 2000.Between July 1995 and September 1996, Borja served as the principal of Hopwood Junior High School on Saipan.