Theo graduated from Airport High School in 1969. He attended Clemson University, graduating in 1973 with a degree in Secondary Education (History), He completed his education at the University of South Carolina School of Law, graduating with a Juris Doctorate in 1975. Theo is a member of the Lexington County Bar Association, South Carolina Bar Association, South Carolina Association of Criminal Defense Lawyers, National Association of Criminal Defense Lawyers and the South Carolina Association for Justice. Theo is admitted to practice before the United States District Court and the United States Supreme Court. Theo has maintained a practice In Lexington since 1976 focusing primarily in the areas of criminal law, traffic cases, personal injury, pardons, criminal appeals, post-conviction relief and civil litigation.