Atty. Ciaran Anthony O'Sullivan

Atty. Ciaran Anthony O'Sullivan

Ciaran Anthony O'Sullivan is a lawyer practicing trusts & estates, litigation, estate planning. Ciaran received a B.A. degree from University College of Dublin, and has been licensed for 28 years.

San Francisco San Francisco 28 yrs experience 28 year
Call (951) 900-7829 Book Appointment

Profile Summary

About Ciaran Anthony O'Sullivan at a glance

Ciaran Anthony O'Sullivan is a trusts, estate planning, and litigation attorney based in San Francisco, California. They have 28+ years of legal experience, licensed to practice since 1998. Admitted to practice in California (1998). Educated at University of California, Hastings College of the Law (J.D., 1998) and University College of Dublin B.A. (—). Serands clients in San Francisco, CA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Ciaran Anthony O'Sullivan is a lawyer practicing trusts & estates, litigation, estate planning
  • Ciaran received a B.A. degree from University College of Dublin, and has been licensed for 28 years
  • Ciaran practices in San Francisco, CA

Practice Areas Explained

Ciaran Anthony O'Sullivan's Areas of Practice

Each practice area below reflects the types of cases Ciaran Anthony O'Sullivan handles, with a brief overview of what that area of law covers.

Trusts

Ciaran Anthony O'Sullivan is one of 104,171 trusts attorneys indexed nationally. Browse trusts attorneys in California →

Estate Planning & Probate

An estate planning attorney prepares wills, trusts, powers of attorney, and healthcare directives to protect your family and pass on your assets.

Ciaran Anthony O'Sullivan is one of 226,536 estate planning attorneys indexed nationally. Browse estate planning attorneys in California →

Civil Litigation

Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.

Ciaran Anthony O'Sullivan is one of 454,532 litigation attorneys indexed nationally. Browse litigation attorneys in California →

Jurisdictional Context

Why local counsel matters in California

Practicing law in California. Legal matters in California are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in San Francisco are typically filed in the local municipal court or the appropriate California state district court, depending on subject matter and amount in controversy. An attorney licensed in California 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 California courts without local counsel or pro hac vice admission.

Looking for additional California attorneys? Browse all attorneys in San Francisco or all attorneys in California.

Frequently Asked

Common questions about Ciaran Anthony O'Sullivan

Where is Ciaran Anthony O'Sullivan's law office located?
Ciaran Anthony O'Sullivan's law practice is located in San Francisco, California. You can contact the office directly through this profile page.
What practice areas does Ciaran Anthony O'Sullivan handle?
Ciaran Anthony O'Sullivan focuses on trusts, estate planning, litigation. Each practice area listed reflects experience handling cases of that type in California.
How long has Ciaran Anthony O'Sullivan practiced law?
Ciaran Anthony O'Sullivan has 28+ years of legal experience and has been licensed since 1998.
Where did Ciaran Anthony O'Sullivan go to law school?
Ciaran Anthony O'Sullivan earned their education at (J.D., 1998); (—).
How can I contact Ciaran Anthony O'Sullivan for a consultation?
You can contact Ciaran Anthony O'Sullivan 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.

Education

J.D.
University of California, Hastings College of the Law
- 1998
University College of Dublin B.A.
- In Progress

Bar Admissions

California
Admitted: 1998

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