Erin A. O’Brien

Erin A. O’Brien - Long Island Tax Certiorari & Condemnation Lawyer

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 2019, Ms. O’Brien 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



“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


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