Pope Francis Friday named Bishop Robert D. Gruss of Rapid City, South Dakota, the next bishop of the Diocese of Saginaw, Michigan. Gruss, 63, was bishop of Rapid City since 2011. A native of Arkansas, he was ordained to the priesthood for the Diocese of Davenport, Iowa in 1994, after a career as a commercial airline pilot and aviation instructor. During his seminary formation, Gruss studied sacred theology and also received a master’s degree in spiritual theology. The Diocese of Saginaw spans 11 counties and 6,955 square miles in mid-Michigan, and has around 100,000 Catholics.