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

Patrick Harrington O'Brien

CPA · O'Brien, Riley & Ryan, P.C.

Braintree, Massachusetts 02184

Patrick Harrington O'Brien, CPA in Braintree, MA

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Patrick Harrington O'Brien, CPA in Braintree · CPA Seek