In 1968, he took his master's degree in political science from the Wayne State University in Michigan.
From 1989 to 1995, he held various executive positions in the Thai Armed Forces' Supreme Command Headquarters.
From 1996 to 1997 he directed the 114 Coordinating Center of the Internal Security Operations Command (ISOC).
[4] He lost his office on 25 July 2012, when a court convicted him for malfeasance during his tenure as chief ombudsman.
According to the verdict, Teeradej had wrongfully awarded himself and his fellow ombudsmen monthly meeting allowances.