 Mitchell established the law firm Theo W. Mitchell and Associates in Greenville to specialize in civil rights, human rights and criminal law.However, the state Supreme Court issued a public reprimand in 2005 to Mitchell because of the use of the word Associates in the law firm's name because there were no other practicing attorneys in his law firm that were licensed in South Carolina.Mitchell also serves on the Board of Directors of the LaRouche Movement's Schiller Institute.