William Petrillo The Law Offices of William S. Petrillo (516) 678-2800
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William Petrillo, a member of the New York Bar since 1995, limits his practice exclusively to the defense of criminal cases. He defends cases in state and federal Court, ranging from minor crimes to the most serious and complex offenses. Many of Mr. Petrillo’s cases have been publicized by every major television network and newspaper, including several that received national recognition. He has procured acquittals in many difficult cases, including high profile trials.

After graduating from St. John’s University, Mr. Petrillo joined the New York City Police Department where he gained valuable life experience as a police officer for six years. He then left the police department to attend the City University of New York School of Law at Queens College. Upon graduating from law school in 1994, Mr. Petrillo became an assistant district attorney at the Nassau County District Attorney’s Office where his career in litigation began. He immediately distinguished himself as a trial attorney and was quickly promoted to the felony trial bureau. Here he was assigned a wide variety of very serious cases and acquired extensive trial experience.

After obtaining invaluable courtroom experience, Mr. Petrillo entered private practice in 1998 when he joined a criminal defense firm. Here, he continued on his path as an active trial lawyer and established himself as the firm’s in house trial counsel. For the next four years Mr. Petrillo continually and successfully tried a wide range of cases in multiple jurisdictions ranging from the most serious and complex cases to minor crimes. In 2002, Mr. Petrillo founded The Law Offices of William S. Petrillo, P.C. He continues to regularly try cases and concentrates exclusively in all aspects of criminal defense in state and federal court. Mr. Petrillo is often referred cases that are trial ready from other attorneys. He is routinely consulted by members of the legal community to advise on trial issues and issues of criminal law, and has been retained by law firms as a consultant to assist their attorneys. Mr. Petrillo is a sought after lecturer who has taught large groups of lawyers and law students on many occasions. Mr. Petrillo is listed in The National Trial Lawyers Top 100 Criminal Defense Trial Lawyers and is a member of The National Association of Criminal Defense Attorneys, The New York State Association of Criminal Defense Attorneys, The New York State Trial Lawyers Association, The Criminal Courts Bar Association of Nassau County, The Nassau County Bar Association and The Former Assistant District Attorney’s Association of Nassau County.