MDU Resources Group Inc. has named Jason L. Vollmer to the position of treasurer and director of cash and risk management, effective Nov. 29, to replace Douglass A. Mahowald, who will retire after nearly 33 years with the company.

Vollmer joined MDU Resources in 2005 as a financial analyst. He has held a number of accounting and finance positions with increasing responsibility, most recently as manager of the treasury, cash and risk management department.