Jeff Main, CPA in Belle Fourche, SD and Ketel Thorstenson, LLP in Rapid City, SD are pleased to announce a merger, which took effect on Dec. 1, 2014. The combined firm will operate as Ketel Thorstenson, LLP.

This merger will provide clients in Belle Fourche and the surrounding area a wider array of services through more depth of expertise. The firm’s capabilities include: Audit Services, Tax Planning and Return Preparation, Bookkeeping, QuickBooks, Payroll, Business Valuations, Management Consulting, Estate Planning and more.

Jeff Main started his CPA practice in 2010 and has served many individuals and businesses in the Belle Fourche area. Main will assist with the merger and remain on at the Belle Fourche location. Ketel Thorstenson, LLP began its professional practice in Rapid City in 1936. The firm has grown by merger or acquisition with over 12 smaller practices in the Black Hills area since that time, and currently has 100 employees and 17 partners.

“Jeff Main, CPA shares the same values we do. We promise to continue the tradition of excellent service and a friendly client environment,” said Denise Webster, Managing Partner, Ketel Thorstenson.

The merged firm will keep the same office, address and phone, 603 Railroad St., Belle Fourche, South Dakota 57717, 605-568-2200. Ketel Thorstenson, LLP also has offices in Rapid City, Custer and Spearfish, South Dakota, and Williston, North Dakota. Visit for information about the firm and services provided.