The Advanced Ability Center was a breakaway organization from the Church of Scientology established by former Scientologist David Mayo after he left the Church in February 1983, a time when most of Scientology's upper and middle management was removed following the formation of the Religious Technology Center (RTC) and RTC head David Miscavige's restructuring of the church. David Mayo had been Hubbard's own auditor. The Advanced Ability Center later became the Theta International movement and was also known as the Church of the New Civilization.