your trusted partners

We remain a top Southern California accounting firm through an unmatched dedication to quality service.



Our Mission

Soren Ahern and Christenson was founded in 1979 in San Bernardino, California, and Ziilch, McAdam and Copeland dates back to 1950 in Redlands, California. 

From the beginning it’s been our mission to provide our clients with exceptional service through teamwork, and our employees and partners challenging and rewarding careers.


Audits & Reviews

Your trusted resource for financial statement audits, reviews or compilations.
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Accounting Services

We'll serve as your advisor dedicated to your long-term success.
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Litigation Services

Our team has the skills to analyze, interpret and present complex financial issues.
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Business Valuations

We understand that every company has unique qualities critical to it's value.
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SOX Consulting

Stay in full compliance with these regulations with our outsourced SOX services.
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Advisory Services

Bringing you expertise that might not be available within your management team.
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Industry Experts

Our Partners

Roger E. Wadell, CPA
Cindy Watts, CPA
Lucia A. Whyte, CPA
Charlie Lowenberg, CPA
Joseph Horzen, CPA
Jason B. Lewis, CPA
Julia Cox, CPA
Katie Vander Veen, CPA