Credit Unions When you work with Gardiner Thomsen your audit is conducted by a firm of professionals with years of experience and insight into credit unions. This experience allows us to perform your audit efficiently and effectively, using programs developed by experts in the field, which are updated annually to include information from the National Credit Union Association and other regulatory organizations. We will interpret what we learn about your credit union, over the course of the audit, to provide you with value-added feedback and suggestions. Plus, we are large enough to offer the wide range of services required by some of Iowa’s largest credit unions, yet small enough to maintain a close relationship with each of our credit union clients, regardless of their size. We deliver exceptional personal service by professionals that care about the success of your credit union.