Sophisticated & Creative Legal Solutions

The Law Office of John J. Leonard is a full-service law firm offering its clients sophisticated and creative legal solutions in a variety of practice areas. With over 18 years of litigation and transactional experience, we handle your cases as if they were our own.

Contact us today if you need legal assistance with any of the following:

  • Criminal Law
  • Employment Law -- Employee
  • Estate Planning
  • Family Law
  • Real Estate Law
  • Landlord Tenant Law
  • Business Law

Contact us at 631-458-1710‬ today to arrange your initial consultation.

Attorney John J. Leonard

Bar Admissions:

  • New York
  • California

Professional Memberships and Achievements:

  • New York State Bar Association, Member
  • Suffolk County Bar Association, Member


  • New York Law School, New York, New York, 2001
    • J.D.
    • Honors: summa cum laude
    • Law Review: NYLS Law Review, Editor in Chief, 2000 - 2001
  • New York University, 1992
    • B.A.
    • Major: English Literature
“John Leonard has provided several legal services for our daughter. He has worked endlessly and above and beyond to provide her with legal counsel tempered with care and kindness. His qualities of determination, approachability and legal expertise have been evident throughout this trying ordeal. I intend to use John in other legal matters in the future. We recommend him without hesitation.” — SUSAN G.  
“I have valued my friendship with John Leonard for many years and recently have become a client. His character is the DNA for the outstanding attorney that he is. When you engage John as your lawyer, you get intelligence, honesty, tenacity and accessibility. John Leonard brings creative reach to a logic based endeavor. Don’t be fooled by his approachable demeanor. John is a sympatico shark. Expect to feel like his only client, relieved of your burden and confident that he’s “got your back”. I endorse him without reservation.” — ANITA G.  
“John Leonard did a spectacular job with my real estate deal. He went well above and beyond the call of duty. For nearly a year, I had an endless stream of phony buyers and difficult brokers come and go. And all of them, except the last one, did nothing more than waste my time and, especially, John’s time. More hours were spent than either of us could count. John dealt with each and every situation as competently and professionally as possible. And in the end he was more then fair with his fee. I highly recommend him!!!!” — MICHAEL P.

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