On March 7, 2017, Brent P. Jensen, the Vice President, Finance and Treasurer of Whiting Petroleum Corporation, who was the company's designated principal accounting officer, informed the company that he will resign effective March 17, 2017. Effective March 17, 2017, Sirikka R. Lohoefener, the current Controller of the company, will be the Controller and Treasurer of the company and the company's designated principal accounting officer. Ms. Lohoefener joined the company in June 2006 as a Senior Financial Accountant, became Financial Reporting Manager in January 2011 and was appointed Controller in March 2015. She was previously with Wagner, Burke & Barnes, LLP.