He also presided over the Potter County Court at Law Number 1 in Amarillo for four years.
In September 2002, Overstreet returned to Texas Southern University, where he served as the director of the Legal Clinic and professor of evidence and criminal procedure for four years.
In private practice, Overstreet served as general counsel to the Texas State Baptist Convention and chair of its statewide Bible Drill Competition.
He also served as the national legal counsel for Phi Beta Sigma fraternity and was a former chair of the State Bar Crime Victims Committee.
He was also a life member of both the National Association for the Advancement of Colored People and Phi Beta Sigma fraternity.