Atty. John A. O'Callaghan

Atty. John A. O'Callaghan

John A. O'Callaghan is a lawyer practicing taxation.

Harwich Port Harwich Port 71 yrs experience 71 year
Call (781) 881-5038 Book Appointment

Profile Summary

About John A. O'Callaghan at a glance

John A. O'Callaghan is a tax attorney based in Harwich Port, Massachusetts. They have 71+ years of legal experience, licensed to practice since 1955. Admitted to practice in Massachusetts (1955). Educated at Boston College (J.D. Boston, 1955). Serands clients in Harwich Port, MA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • John A. O'Callaghan is a lawyer practicing taxation
  • John has been licensed for 71 years
  • John practices in Harwich Port, MA

Practice Areas Explained

John A. O'Callaghan's Areas of Practice

Each practice area below reflects the types of cases John A. O'Callaghan handles, with a brief overview of what that area of law covers.

Tax Law

Tax attorneys handle IRS audits, tax debt, international tax, estate planning, and tax court litigation.

John A. O'Callaghan is one of 85,302 tax attorneys indexed nationally. Browse tax attorneys in Massachusetts →

Jurisdictional Context

Why local counsel matters in Massachusetts

Practicing law in Massachusetts. Legal matters in Massachusetts are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Harwich Port are typically filed in the local municipal court or the appropriate Massachusetts state district court, depending on subject matter and amount in controversy. An attorney licensed in Massachusetts brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in Massachusetts courts without local counsel or pro hac vice admission.

Looking for additional Massachusetts attorneys? Browse all attorneys in Harwich Port or all attorneys in Massachusetts.

Frequently Asked

Common questions about John A. O'Callaghan

Where is John A. O'Callaghan's law office located?
John A. O'Callaghan's law practice is located in Harwich Port, Massachusetts. You can contact the office directly through this profile page.
What practice areas does John A. O'Callaghan handle?
John A. O'Callaghan focuses on tax. Each practice area listed reflects experience handling cases of that type in Massachusetts.
How long has John A. O'Callaghan practiced law?
John A. O'Callaghan has 71+ years of legal experience and has been licensed since 1955.
Where did John A. O'Callaghan go to law school?
John A. O'Callaghan earned their education at (J.D. Boston, 1955).
How can I contact John A. O'Callaghan for a consultation?
You can contact John A. O'Callaghan directly through this profile page. Click "Ask the Attorney" to submit a question, or "Schedule a Consultation" to book a meeting. Most claimed-profile attorneys respond within one business day.

Practice Areas

Education

J.D. Boston
Boston College
- 1955

Bar Admissions

Massachusetts
Admitted: 1955

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