Mastic Lawyers

Attorney at Law focusing primarily in criminal law. J.D. from Hofstra University School of Law 1994. Retired Lieutenant Suffolk County Police Department. Masters Degree from Long Island University in Professional Studies. Bachelors Degree from SUNY Cortland in Sociology/Education.

Retired Government Mediator 2005 - 2015 Retired Police Lieutenant 1987 - 2007

John W. DeHaan has spent the last decade advocating to insure that his clients receive the disability benefits they rightly deserve.

Prior to forming The DeHaan Law firm, Mr. DeHaan was the Supervising Attorney for Binder and Binder, P.C.’s long-term disability department and managed this national litigation department, winning cases in both the federal and state courts from New York to California. He is admitted to practice law in the courts of the State of New York; the U.S. District Courts for the Eastern, Southern, Northern, and Western Districts of New York; the United States Court of Appeals for the Second...