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Dennis D. Theis, CPA
Director, Principal, Audit

“When working with clients, I feel it is important to always be honest and fair. It is also necessary to discuss key options and potential results to assist in arriving at the best choice for them.”


Dennis joined Maner Costerisan in 1990 upon his graduation from college. As a principal, he focuses his practice on providing financial statement related services to clients throughout various industries including manufacturing and distribution, nonprofit organizations, and governmental and retail entities. Providing clients with opportunities for improvement is a key goal in each relationship.

Beyond his client service responsibilities, Dennis plays numerous other roles at Maner Costerisan and is an integral part of the firm’s success and execution; for example, he serves as director of the closely held business niche. Dennis is a member of Maner Costerisan’s marketing committee and education services group, and is the leader of the manufacturing and distribution solutions group. He also assists clients in utilizing the additional resources of the BDO Business Resource Network (BRN), which is designed to improve performance by reducing costs and improving technology and operational efficiencies.

Dennis was inspired to go into the accounting field because he recognized that accounting gave a broad perspective on many different facets of business. Dennis attributes his success to always listening to and anticipating client needs, the vast resources of Maner Costerisan and a strong work ethic.

Dennis was raised on a dairy farm in Central Michigan, the youngest of 11 children. He currently resides in Lansing with his wife, Luann, and their three daughters. In his free time, Dennis can usually be found outdoors where he enjoys boating, kayaking and fishing with his family at his cottage. He also likes to run, and play catch and lawn games with his family.

Designations
  • Certified Public Accountant (CPA) – Michigan and Washington, D.C.
Memberships
  • American Institute of Certified Public Accountants (AICPA)
  • Michigan Association of Certified Public Accountants (MICPA)
    • Chair, Manufacturing Task Force
  • Institute of Management Accountants (IMA)
  • Career Connections Educational Advisory Board
    • Volunteer
Education
  • Ferris State University – Bachelor of Science, Accountancy (1990)