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.

Dennis O'Connor

CPA · O'Connor, Wells & Vander Werff, LLC

Waupun, Wisconsin 53963

Dennis O'Connor, CPA in Waupun, WI

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Dennis O'Connor, CPA in Waupun · CPA Seek