Listed as a CPA in IRS public preparer records. Source: IRS PTIN FOIA extract (Feb 2026), retrieved October 23, 2026. https://www.irs.gov/pub/foia/foia-michigan-extract.csv No state license number is on file. Specialties are blank until this preparer claims the listing. CPA Seek does not contact preparers.

Mark Koester

CPA

Dewitt, Michigan 48820

Mark Koester, CPA in Dewitt, MI

Specialties

No specialties are listed yet. They stay blank until the licensee claims this profile and adds them.

Licenses

No state license number is on file.

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