10/29/2026
Olsen Thielen turns 105 this year! 🎂
Olsen Thielen was founded in 1921 on the belief that personal attention, trust, and quality service were the key elements to helping our clients succeed. Over 105 years later, that commitment remains. Our longevity and growth can be attributed to building strong relationships with our clients and continuing to earn their trust.
105 years of audit and tax service
105 years of dedicated CPAs and Advisors
105 years of amazing clients and friends of the firm
We're excited for many more to come!