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-wisconsin-extract.csv No state license number is on file. Specialties are blank until this preparer claims the listing. CPA Seek does not contact preparers.

Jon S Chamberlain

CPA · Chamberlain | Otte, CPAs, LLP

Lake Geneva, Wisconsin 53147

Jon S Chamberlain, CPA in Lake Geneva, WI

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Jon S Chamberlain, CPA in Lake Geneva · CPA Seek