Former Reds GM Wayne Krivsky brought Miller aboard the organization as director of baseball administration, and he was promoted to assistant GM in June of that season. He added vice president to his title in December 2006.
Under current GM Walt Jocketty, Miller assisted in several areas -- including arbitration cases, contract negotiations and the intricate details of Major League rules and procedures.
A replacement for Miller has not been named by the Reds.
Mark Sheldon is a reporter for MLB.com. Read his blog, Mark My Word, and follow him on Twitter @m_sheldon. This story was not subject to the approval of Major League Baseball or its clubs.