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Lisa Dunnigan to Retire August 31, 2025

Lisa Dunnigan, Principal and Chief Information Officer, will be retiring effective August 31, 2025. 
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Olsen Thielen Honored to Receive the 2024 VHEDC Keith Warner Standard of Excellence Award

Olsen Thielen is a long time supporter of the VHEDC, it’s members and mission, and we are honored to receive the VHEDC Keith Warner Standard of Excellence award. Our engagement in the community and volunteer groups is vital to our staff and who we are as a firm.
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New Olsen Thielen Principals Elected

Olsen Thielen has elected four new principals to our firm leadership including: Rob Mathewson, Tony Oman, Charlie Sparks, and Carrie Sundberg.
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Greg Nelson to Retire August 31, 2024

Tax Principal, Greg Nelson will be retiring from Olsen Thielen, effective August 31, 2024.
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Olsen Thielen Named a Regional Leader

Olsen Thielen has been named a "Regional Leader" on Accounting Today's list of "Top Firms in the Midwest" for 2022. OT ranks as one of the top-performing CPA firms with under 100 employees as well.
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Olsen Thielen Celebrates 100 Years

Nearly 100 years ago, Olsen Thielen was founded on the belief that personal attention, trust, and quality service were the key elements to helping our clients succeed, and that commitment remains.  commitment to their clients and their community. 
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Linda M. Nelson to Retire December 31, 2020

After a long and remarkable career, Linda Nelson has decided that effective December 31, 2020, she will be retiring from Olsen Thielen.  We want to thank Linda for her knowledge, dedication, and everything she did for clients and colleagues.
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Remembering Robert J. Olsen

With great sadness we announce the passing of a Robert J. Olsen on March 13th.  Bob was a terrific business leader, mentor, husband, and father.  Bob and Reynold Thielen took the reins of the firm in 1957 and led it through a period of tremendous growth. 
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