Small & Midsize Businesses

Growth. From Goal to
Mindset to Reality.

Growing Companies Is What We Do Best.

For a century, small and midsize companies have come to us for help to succeed and grow. In addition to day-to-day small business accounting support, we assist with financial team staffing issues, time and resourcing struggles, and even technology challenges. Our team of experts can provide small business planning and decision-making support to help you reach your goals.

The Maner team does great work  and are always on top of things! They have helped us make better business decisions that help our bottom line.

Jamie Buckingham, Triterra, LLC

The firm immediately grasped my needs and my financial limitations. Everyone I’ve dealt with gave me the best service in the most cost-effective manner.

JT Stout, Renaissance Massage, LLC

I value the close professional relationship, top-quality work and sound counsel Maner provides.

Phillip Frangos, Frangos Family LLC

No One is More Comfortable Turning Big Dreams into Realities.

Running a small business is exhilarating. It is also challenging and requires all the small business help and resources you can get. We know, because we’ve supported franchises, single and multi-business entities, restaurants, bars and their suppliers, corporations, family businesses, private practices and others make their big dreams into even bigger realities.

Future-Focused Solutions

Tailored to Your Needs

Experts in Tech Integration

Maner Team Expert

Dennis Theis, CPA, CVGA, Principal, Director

Dennis is a principal in the Audit and Accounting and Outsourced Solutions departments. 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 small and midsize businesses 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.

I get excited about helping others reach their potential. Using what I know to produce the best result with our team for our clients is what is most rewarding to me. It has not only stretched me professionally but has provided me great personal satisfaction.

Years of Experience



American Institute of Certified Public Accountants (AICPA)

Michigan Association of Certified Public Accountants (MICPA)


Certified Public Accountant (CPA) – Michigan and Washington, D.C.

Certified Value Growth Advisor (CVGA)

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Relevant Services

Accounting & Outsourced Solutions

Accounting & Outsourced Solutions

With temporary or permanent customizable accounting services, we take the workload off you, helping with everything from weekly bookkeeping to high-level financial analysis.

Business Tax Planning

Business Tax Planning

With your goals in mind, our experts design innovative tax strategies to create opportunities to save your business money today and in the future.



From special projects to M&A, we offer the variety of critical decision making support, consulting and advisory services you need for your business to reach its goals.

Business Accounting Software

Business Accounting Software

Leveraging cloud-based technology, we help you create a seamless system with both, streamlined processes and improved efficiency. Saving you time and money, while providing the vital information you need.

Succession Planning

Succession Planning

When you’ve poured your heart into your life’s work, the right plan is crucial to help your business live on. With our help, your plan can set you and your business up for success prior to and during a business transition or sale.

Wealth Management

Wealth Management

Our holistic approach ensures you’re investing your hard-earned money properly to achieve the secure retirement of your dreams.

Strategic Planning

Strategic Planning

With big-picture thinking, we help businesses define the actionable steps to achieve their short and long-term goals.

401k & Qualified Retirement Planning

401k & Qualified Retirement Planning

Our experts help organizations design benefits plans to help attract and retain top talent, while meeting federal requirements.

Employee Benefit Plan Audit

Employee Benefit Plan Audit

Our team provides comprehensive audits of employee benefit plans, ensuring efficient and accurate plan management and compliance with federal regulations.


Years of Experience Serving Small & Midsize Businesses Across Michigan


Net Promoter Score


Dedicated Small & Midsize Business Experts


Million in Federal
COVID-19 Relief Funding
for our Clients

Industry Insights

Info Sheet

Your Niche Is Our Specialty.

When it comes to your unique financial needs, Maner Costerisan has the experts, tools, and services to stay focused on your next move.

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