Erin A. O’Brien

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Erin A. O’Brien is a Partner in our Tax Certiorari and Condemnation Practice Group.

Prior to joining Certilman Balin, she was a Partner at the law firm of Cronin, Cronin, Harris & O’Brien, P.C.

She has successfully litigated before the Supreme and Appellate Courts throughout the State of New York, creating legal precedent with the arena of tax certiorari law.

Admitted to practice in the Eastern District, as well as the States of New York and Connecticut, Ms. O’Brien is a member of the New York State Assessors’ Association, the New York State Bar Association, and both the Nassau and Suffolk County Bar Associations. In addition, she serves on their Tax Certiorari and Real Property Committees. She also serves on the Condemnation and Tax Certiorari Committee of the New York City Bar Association.

Ms. O’Brien is also a founding member of Women in Tax Assessment (WItA), serves on the associate board of the Association for a Better Long Island (ABLI) and has been a guest speaker at various symposiums throughout New York State.

In 2023, Ms. O’Brien was named to the New York Metro Super Lawyers list. Long Island Business News named her to the “Top 50 Women in Business” list, and in 2022 she was named to its “Who’s Who in Tax Certiorari Law” list. In 2019 she was featured by the New York Real Estate Journal as one of its “Women in Real Estate.”

Ms. O’Brien earned her Juris Doctor from the City University of New York School of Law where she was a member of Law Review. She earned her Bachelor of Arts from North Carolina State University.


City University of New York Law School, J.D., 2005
North Carolina State University, B.A., 1996

Bar Admission(s)
New York

Court Admissions
U.S. District Court, Eastern of New York
Circuit Court of Appeals, Second Circuit
U.S. Supreme Court

Bar Associations
New York State Bar Association
Nassau County Bar Association
Suffolk County Bar Association
New York City Bar Association, Condemnation and Tax Certiorari Committee

New York Metro Super Lawyers, 2023
“Top 50 Women in Business,” Long Island Business News, 2023
“Who’s Who in Tax Certiorari Law,” Long Island Business News, June 2022
“Women in Real Estate,” New York Real Estate Journal, September 2019

“Home Team Advantage?: The Taking of Private Property for Sports Stadiums,”New York City Law Review

“Property tax exemptions: Are you paying more property taxes than you should be?”
New York Real Estate Journal


Association for a Better Long Island, Board Member
Women in Tax Assessment, Founding Member
New York State Assessors’ Association, Member