Jonathan A. Baum, Esq.

Jonathan A. Baum, Esq.

Jonathan A. Baum joins Mediation Solutions after a distinguished 36-year legal career in which he practiced in both the New York State and Federal Courts and has handled hundreds of mediations, arbitrations, hearings, and trials.

Jon has represented both plaintiffs and defendants in a variety of complex matters including personal injury, construction litigation, premises, products liability, motor vehicle negligence, contracts, dental malpractice, insurance coverage, foreclosure, real estate, wills, and estate planning.

He began his career representing defendants for several major insurance carriers and then representing defendants in private practice. After 18 years in practice as defense counsel, he joined the well-known plaintiff’s firm of Siben and Siben, as Senior Trial Attorney and then head of the Trial Department, where he remained until March 2025 when he went into private practice. He is currently practicing on his own and also providing court coverage for other attorneys.

​​​​Jon's diverse practice areas have provided him with a comprehensive understanding of the law. He has been a regular in the courthouse for over 30 years and is well respected by attorneys, judges, and court personnel, and has been appointed as a court referee in both foreclosure and real estate matters.

He brings his deep knowledge of mediation, trial practice, and personal injury to help Mediation Solutions’ clients resolve their personal injury matters.

Jon has been active in numerous professional associations and has held many leadership positions in the legal community. He served as Co-Chairman of the Suffolk County Bar Association’s Supreme Court Committee for three terms, where he played a pivotal role in shaping and enhancing the relationship between the Bar and the judiciary. He is a past member of the Judicial Screening Committee and both the Plaintiff’s and Defendant’s Negligence Committees of the Suffolk County Bar Association.

Jon was the Chairman of the Nassau-Suffolk Trial Lawyers Association from 2019-2021, an organization which promotes cooperation between the plaintiff’s and defendant’s bars as well as promoting dialogue and discussion with the judiciary.

​​​​Jon’s diverse practice areas have provided him with a comprehensive understanding of the law and the court system and his ability to navigate complex legal issues make him an excellent choice to mediate or arbitrate your personal injury case. He brings a wealth of experience, a strong reputation for excellence, and an unwavering commitment to achieving the best outcomes for Mediation Solutions’ clients.

Jon will provide personal injury mediation and arbitration services both virtually and in person in our Islandia office.

 Mediating/Arbitrating Cases In:

  • Personal injury

Professional Experience

Per Diem attorney in Riverhead Supreme Suffolk Court (2025 – Present)

Senior Trial Attorney and Head of Trial Department, Siben & Siben, LLP (2007- 2025)

Senior Trial Attorney, Nashak & Andreotta, Esqs. (2003-2007)

Assistant Managing Attorney, Richard J. Baldwin, Esq. (1993-2003)

Senior Trial Attorney, Langan & Levy, Esqs. (1989-1993)

 

Memberships and Professional Associations

Co-Chairman, Supreme Court Committee, Suffolk County Bar Association (2006-2008, 2013-15, 2018-2020)

Chairman, Nassau-Suffolk Trial Lawyers Association (2019-2021),

Board of Directors Nassau-Suffolk Trial Lawyers (2013-present).

Past member, Judicial Screening Committee, Suffolk County Bar Association

Past member, Plaintiff’s Negligence Committee, Suffolk County Bar Association

Past member, Defendant’s Negligence Committee, Suffolk County Bar Association

Education

Brooklyn Law School, J.D., 1988

University at Albany, BA, Political Science and Government/History, 1984 cum laude