“It helps a lot when you understand the people you work with. That’s pretty much why we do what we do.”

These are our CPAs.
What can yours do?


Agribusiness & Cooperatives

Agribusiness is one of the most uniquely diverse industries, and we have the flexibility and work ethic to meet your accounting and cooperative auditing needs. We are an experienced and trusted firm whose knowledge of the industry can be put to work for you.

Credit Unions

Our experience and knowledge of the credit union industry can help you navigate the ever-changing landscape of regulations and requirements. Our insight into the field and our personalized customer care has allowed us to serve more Iowa credit unions than any other firm in the state.

Governmental Entities

The needs of city or county government auditing are unique and require the type of knowledge and experience Gardiner Thomsen has. We specialize in partnering with government bodies of any size, so our clients know they are getting the best service to best serve their constituents.


Cyber Risk Insurance

By Dennis Gardiner, Managing Partner, CPA

Do you have insurance to address an intrusion or breach of your computer systems, or a lost or stolen laptop or even a flash drive? Do you think you have limited exposure? Very large companies, or even the US Government undoubtedly have very sophisticated security over their data processing systems. Yet, T-Mobile, Experian (a credit […]

“...Gardiner Thomsen is a leader in the agribusiness auditing for cooperatives. Our partnership with the firm has history and ongoing meaning for our cooperative to take us to the next level in our size and scope of our future business.”

Jim Carlson, General Manager, First Cooperative Association

Stay in Touch