Montana’s CPA Firm History

Founded in 1957 in Helena, Montana, AZ has grown to be Montana’s CPA, technology solutions, and business advisory firm with over 200 professional and administrative support personnel in offices throughout the state. For our entire history, our firm was based on the principle of building relationships and providing excellent client service. Today, our mission remains the same.

We’ve provided tax, audit, accounting, and advisory services to individuals and organizations in the Northwest for more than half a century. Our attention to your needs will enable you to respond confidently to changing personal circumstances or business environments, as well as the dynamics of a global economy.


George Anderson andCarl ZurMuehlen form the partnership of Anderson ZurMuehlen & Co., Helena, Montana.


Anderson ZurMuehlen & Co., opens office in Butte, Montana.


Anderson ZurMuehlen & Co., opens office in Billings, Montana.


Anderson ZurMuehlen & Co., expands office in Billings, Montana.


Anderson ZurMuehlen & Co., opens office in Bozeman, Montana.


Anderson ZurMuehlen & Co., opens office in Missoula, Montana.


Anderson ZurMuehlen & Co., opens office in Great Falls, Montana.


Anderson ZurMuehlen & Co., opens office in Havre, Montana.


Anderson ZurMuehlen & Co., establishes AZ Technology Services.


Anderson ZurMuehlen & Co., establishes Wealth Management & Leverage Services.


Anderson ZurMuehlen & Co., acquires Information Technology Core (ITC).


Anderson ZurMuehlen & Co., expands into Salt Lake City and Boise markets.

Our history is reflected in our quality services.

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