John H. Gionis


Practice Areas: Litigation Attorneys Criminal Law Attorneys

John H. Gionis is a Partner in the Litigation Group at Certilman Balin. His practice encompasses personal and catastrophic injuries, medical malpractice, real estate, commercial litigation, trusts and estates, and criminal law including white collar crime cases involving fraud. A seasoned litigator, Mr. Gionis has successfully tried to verdict cases in both the state and federal courts in the New York metropolitan area. Prior to joining the firm, he was a Partner at the East Norwich firm of Murphy, Lynch & Gionis, where he tried high profile real estate and tort cases.

A former Nassau County District Attorney from 1983 until 1986, Mr. Gionis is a trial attorney to the core. Known for his cross examination techniques, his aggressive and thorough style in the courtroom enable him to achieve positive results for his clients. A quick study, Mr. Gionis has an uncanny ability to understand the issues from a variety of legal practice areas and is often called upon by his partners to assist their clients, both plaintiffs and defendants, in courtroom trials. Most of his cases are document intensive, especially in matters involving complicated fraud and negligence and disciplinary proceedings.

In 1977, he earned his Bachelor of Arts in English from the State University of New York at Albany; and in 1982, he earned his Juris Doctor from California Western School of Law at San Diego where he graduated in the top 2% of his class and received the Jurisprudence Award in Trial Advocacy.

Throughout his career, Mr. Gionis has lectured on numerous issues including real estate and trusts and estates and has served as the CLE Director of the American Inn of Courts.

He was recently appointed to serve on the Grievance Committee for the 10th Judicial District. In addition, Mr. Gionis has achieved the highest professional rating by Martindale Hubbell. In April 2013, Mr. Gionis was awarded a “Legal Eagle” for Civil and Criminal Law from LI Pulse Magazine. He was named to the 2017, 2016, 2015 and 2014 New York Metro Super Lawyers list.

Admitted to practice in the State of New York and in both the Eastern and Southern Federal Courts in New York, Mr. Gionis is a member of the Nassau, Suffolk, New York and American Bar Associations. He is fluent in Greek and is involved in the American Hellenic Educational Progressive Association (AHEPA).