MDU Resources names Jason Vollmer to CFO position, Stephanie Barth to CAO

BISMARCK, N.D., Sept. 21, 2017 /PRNewswire/ -- MDU Resources Group, Inc. (NYSE: MDU) today announced that Jason L. Vollmer has been promoted effective Sept. 30 to vice president, chief financial officer and treasurer, replacing Doran N. Schwartz as CFO. Schwartz has resigned to accept a...