Jones also served as director of the Illinois Department of Revenue and as general manager of radio station WGRT ( later WJPC ) in Chicago . He has also served as director of the Illinois Department of Revenue and as General Manager of the WGRT ( later WJPC ) radio station in Chicago . He later served as director of the Illinois Department of Revenue and as General Manager of the WGRT ( also WJPC ) radio station in Chicago .