Dennis O'Brien    

DENNIS O’BRIEN began his career as an Assistant District Attorney with the Nassau County District Attorney’s Office. Serving as a prosecutor from 2002 until 2006, Mr. O’Brien handled a wide array of criminal matters including the most serious violent felonies. Upon leaving the District Attorney’s Office, Mr. O’Brien managed a criminal defense firm in Garden City and Huntington for fourteen years. During that time, he amassed significant litigation experience including grand jury, litigated motions, pre-trial hearings, and trying cases to verdict. His litigation practice also included varied administrative proceedings such as refusal and fatality hearings and the corresponding departmental appeals procedures, firearms licensing, and New York Police Department administrative reviews.

In 2016 Mr. O’Brien was recognized by the members of the Fraternal Order of Court Officers (FOCO), which is an organization of New York State Court Officers and Court Clerks, with the Amicus Fraternitas Award, given to a member of the legal community based on professionalism, dedication and integrity.

He was elected and served as a member of the Board of Directors of the Criminal Courts Bar Association of Nassau County from 2008-2016. During his time on the Board of Directors, Mr. O’Brien chaired the Legal Action Committee, where he authored several Amicus Curiae briefs on behalf of the Association. In 2015, he was elected President of the organization and dutifully served in this office, frequently participating in meetings with senior representatives of the Office of the District Attorney and the Supervising and Administrative Judges of the Courts of Nassau County. In addition to his service with the Criminal Courts Bar Association, he has also served as Vice Chair and Chair of the Criminal Courts Law and Procedure Committee of the Nassau County Bar Association.

Mr. O’Brien is an Adjunct Professor at St. John’s University and has been teaching courses on the law for the past eighteen years. He also continues to present his academic writing at colloquia and conferences throughout the country.

Mr. O’Brien received his J.D. from Brooklyn Law School, M.A. from St. John’s University, and B.A. from St. John’s University. He is also a graduate of Chaminade High School. Mr. O’Brien is a member of the Nassau, Suffolk and New York State Bar Associations, the Criminal Courts Bar Association of Nassau County, and the National Association of Criminal Defense Lawyers, and is admitted to practice law in New York State and the Eastern and Southern Districts of New York.

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Events Calendar
  • UPCOMING EVENTS
  • May 1, 2020
    Hampton Inn White Plains/Tarrytown
    200 West Main Street, Elmsford, New York
    9:00 a.m. to 4:30 p.m.
    Special Education Laws Made Simple

    Timothy Mahoney will be presenting a seminar on disciplinary procedures and managing FBAs, BIPs, physical restraints and isolation techniques. He will also cover suspensions and expulsions; Manifestation Determinations; interim alternative education settings; expedited due process hearings and school actions that can result in lawsuits. For additional information please visit www.nbi-sems.com.



  • May 8, 2020
    Four Points by Sheraton Melville
    333 S. Service Road, Plainview, NY
    9:00 a.m. to 4:30 p.m.
    School Law: Handling Mental Health Issues

    Jack Feldman will be presenting a seminar on balancing special education and mental health concerns; tying IEPs to mental health issues; drafting IEP goals for students; 504 plans: determining eligibility for mental health issues and outlining parameters of required services for students without 504s/IEPs. He will also discuss conducting FBAs and BIPs; performing Manifestation Determination Reviews; changing student placement; when to suspend or expel; handling and responding to bullying; harassment and intimidation; restraining and seclusion; documenting school discipline actions; and making criminal referrals for mental health concerns. For additional information please visit www.nbi-sems.com.


  • RECENT EVENTS
  • February 6, 2020
    Four Points by Sheraton, Melville
    Special Education Law: The Ultimate Guide

    Jack Feldman and Timothy Mahoney will be presenting a seminar on IEPs, 504 plans, Manifestation Determinations Reviews and more on behalf of National Business Institute. Jack will discuss developing legally compliant IEP’s that benefit students, 504 plan eligibility and accommodation best practices. Timothy will discuss bullying and harassment and ensuring special needs students receive free and appropriate public education (FAPE), along with Manifestation Determination Reviews (MDRs). For additional information, please visit www.nbi-sems.com..



  • October 25, 2019
    Rochester Riverside Convention Center
    123 E Main St, Rochester, NY 14604

    Christie Jacobson, Esq., will present at the New York State School Boards Association Annual School Law Conference held on October 24-26, 2019. Ms. Jacobson will present on the topic of “Free Speech in the Era of Social Media.” The audience for this presentation will be school board members, school administrators and school attorneys from throughout the State of New York. For additional information visit WWW.NYSSBA.ORG.

  • October 4, 2019
    IEPs and 504 Plan Legal Workshop

    On October 4, 2019, Jack Feldman and Timothy Mahoney presented a program on 504 plans on behalf of National Business Institute. 504 plans, like IEPs, are essential tools to ensure positive learning outcomes for many students. They also have the potential to cause legal issues for schools if they aren't properly planned and carried out. The seminar addressed key considerations for implementing IEPs, functional behavioral assessments (FBAs) and Behavior Intervention Plans (BIPs). For additional information, please visit www.nbi-sems.com.

  • August 19, 2019
    Live Teleconference 2:00 – 3:30 p.m.

    Jacob S. Feldman, Esq., presented a Live Teleconference Seminar on “Sexual Harassment in Schools: Interpreting the Latest Legal Guidelines”. The program covered the latest school sexual harassment guidelines you need to know. How to determine critical Title IX protections for victims of sexual harassment; how to properly respond to and document allegations using the latest federal guidance; and how to handle delicate sexual violence allegations the right way. For more information please visit www.nbi-sems.com.

  • June 3, 2019
    Four Points by Sheraton Melville Long Island
    333 S Service Road
    Plainview, NY 11803

    Jacob S. Feldman, Esq. and Timothy M. Mahoney, Esq., presented a seminar on “New York Special Education Law”. The program covered compliance with Special Education Laws to avoid liability; Strengthen knowledge of how recent special education legislation affects school policies and operation; Learning what to do and what not to do in 504 plans; Evaluating the legal protection offered by the Individualized Education Program (IEP); How to successfully handle disciplinary actions for students with disabilities; Exploring the role of manifestation determination reviewing the legality of disciplinary actions; and Understanding the rights of special needs students so as to avoid inadvertent illegal actions that may lead to a lawsuit. For further information please visit www.nbi-sems.com.

  • Monday, April 22, 2019
    Hofstra University
    Hempstead, New York

    We are proud to announce that our partner Christie R. Jacobson was honored as one of Hofstra University’s Outstanding Women in Law at an awards dinner reception held on Monday April 22,2019. This recognition celebrates women who have made meaningful and inspiring contributions to the legal community. For more information please visit www.law.hofstra.edu/owl.

  • Friday, December 7, 2018

    Jacob S. Feldman, Esq., presented a seminar on “Special Education”.
    Christie Jacobson, Esq., presented a seminar on “The Non-Resident "Resident" Student”.
    Joseph Lilly, Esq., presented a seminar on “Alcohol and Drugs in the Workplace”.
    Laura Dilimetin, Esq., presented a seminar on “School Safety”.
    For additional information visit www.nassaubar.org..



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