Ciaran O'Sullivan

Ciarán O'Sullivan litigates disputes regarding trusts and estates, real property, and fiduciary-related matters in the trial and appellate courts of California.

Educational History • BA from University College Dublin, Dublin, Ireland • J.D. from Hastings College of the Law, San Francisco Mr. O'Sullivan began his career in 1998 in the Trusts & Estates and Business Litigation groups at the former Crosby, Heafey, Roach & May (now Reed Smith), before moving to Nossaman, LLP. He has been a solo practitioner since 2010.

A former chair of the Bar Association of San Francisco’s Trusts and Estates litigation, Mr. O'Sullivan has served on the executive committee of the California Lawyers Association’s (CLA) Trusts and Estates section (TEXCOM) since 2017. He is now also the Trusts and Estates section’s representative on the CLA board. Mr. O'Sullivan frequently writes and presents, to audiences up and down the state, on topics related to Trusts and Estates litigation law and procedure.