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Ryan Thomas Gannon

Portrait of Ryan Thomas Gannon

Since joining Marshall Dennehey in 2012, Ryan's practice is primarily in the firm's Health Care Department. Ryan focuses his practice on medical, dental and nursing home malpractice. He has also represented nurses in New Jersey Board of Nursing matters and dentists in New Jersey Dental Board matters. Ryan is admitted to the New Jersey and New York State bars, as well as the United States District Court, District of New Jersey.

Following completion of law school at Seton Hall University, where he graduated cum laude, Ryan served as law clerk to the Honorable Ralph L. De Luccia, Jr, J.S.C., in the Civil Division of Passaic County. Since beginning his legal career, Ryan has concentrated his practice in medical malpractice defense.

    • Seton Hall University School of Law (J.D., cum laude, 2008)
    • University of Maryland (B.A., 2005)
    • New Jersey, 2008
    • U.S. District Court District of New Jersey, 2008
    • New York, 2009
    • New Jersey Super Lawyers Rising Star (2014-2023)
      The Super Lawyers list is issued by Thomson Reuters. A description of the selection methodology can be found here. No aspect of this advertisement has been approved by the Supreme Court of New Jersey.
    • New Jersey State Bar Association
    • Passaic County Bar Association

Results

No-Cause Jury Verdict Secured in Wrongful Death Trial

We successfully obtained a no-cause jury verdict in a 13-day wrongful death trial. The decedent, a 59-year-old man, was admitted to the emergency room on February 15, 2019, with complaints of abdominal pain, decreased appetite, and constipation, despite the use of laxatives. The patient did not complain of any nausea, vomiting, or diarrhea. He had a significant medical history including diabetes, hypertension, prior coronary artery stenting, morbid obesity (with past gastric bypass surgery), longstanding ventral hernia, and back pain. A CT scan revealed multiple hernias and a potential closed-loop bowel obstruction, leading to a surgery consultation. Our client, an emergency general surgeon, interpreted that the patient did not have a closed loop or any significant obstruction and recommended non-surgical management. The patient was approved to have clear liquids, and had a vomiting incident shortly after, but our client was not notified. The patient was returned to NPO status, and after improving overnight, he was returned to “clears” and additional medical and renal consults were ordered. Our client did not receive any communications from the residents/nurses of any changes in the patient’s condition. On February 18, 2019, two rapid responses were called due to increased heart rate and vomiting. It is believed that the vomiting resulted in aspiration, causing sepsis, ultimately leading to the patient’s death. During the trial, the plaintiff’s sole medical expert highlighted imaging on the wrong hernia, which called into question all of his opinions in the case. We made key objections related to the expert testimony, limiting what the allegations were, and preventing new allegations from being made. After approximately two and a half hours of deliberating, the jury returned a no-cause verdict. 

Won Unanimous Defense Verdict in High-Exposure Birth Injury Case

We secured a unanimous defense verdict in a high-exposure birth injury case, successfully proving that our client’s obstetric care met accepted standards despite claims of negligence and lasting injury. The plaintiff, the mother, alleged the obstetrician defendant was negligent in failing to identify her baby as large for gestational age in the prenatal period, in failing to proceed with a cesarean section during the labor, and in negligently performing a forceps delivery. The plaintiff alleged, as a result of her injuries from the delivery, she suffered pelvic organ prolapse, incontinence, and ongoing pain and suffering. The plaintiff underwent two subsequent gynecologic surgeries and alleged, as result of her ongoing pain, she would never be able to return to work for the remainder of her life. Through the testimony of our client and experts, we were able to establish the care provided by the obstetrician was within accepted standards of care and the decision to proceed with the delivery as performed was the safest option for the mother and baby. The jury returned a unanimous verdict in favor of our client.   

Firm Highlights

Thought Leadership

Appellate Division Affirms Dismissal of Legal Malpractice Counterclaim Against Martin Law Firm

In Martin v. Loury, 2026 N.J. Super. Unpub. LEXIS 1617 (App. Div. July 15, 2026), Martin Law Firm represented Kirk Loury in an employment matter Mr. Loury filed against his former employer, Concord Equity Group Advisors LLC (“Concord”). The allegations included, among other things, that Loury was not fairly compensated for his employment with Concord. After a bench trial finding in Loury’s favor, the Appellate Division remanded this matter in February 2016 for a second trial. During the second trial, Concord CEO, Lee Argush, testified to lower compensation estimate than first trial. On remand, the second trial judge awarded Mr. Loury the same damages as the first judge, finding Mr. Argush not credible. After the findings during the second trial, Martin Law Firm filed an action against Mr. Loury to recover legal fees and costs of representing Mr. Loury in a second bench trial and Mr. Loury filed a counterclaim against Martin Law Firm for legal malpractice, alleging he should have received an even higher award in the second bench trial. In this allegation, Mr. Loury, through his expert, claimed that Martin Law Firm should have recalled Mr. Loury to the stand to rebut Mr. Argush’s testimony to allege an alternative theory of damages. Mr. Loury’s expert admitted that the second judge already rejected Mr. Argush's theory and accepted Loury's damages theory. The trial court barred Mr. Loury’s expert and dismissed Loury's counterclaim with prejudice before convening the collection trial, and the jury ruled in Martin Law Firm’s favor. Mr. Loury appealed the trial court's pretrial rulings barring his liability expert from testifying in support of his legal malpractice counterclaim, denying his motion for summary judgment on that counterclaim, and denying his motion to amend his counterclaim by adding attorney Joseph A. Martin as a codefendant. In affirming the trial court’s decision, the Appellate Division held that the trial court properly excluded Loury’s expert testimony in the counterclaim against Martin Law Firm because the expert could not explain how calling Loury as a rebuttal witness would have increased damages when the second judge already rejected Mr. Argush's testimony and accepted Loury's damages theory, making the expert’s causation opinion speculative. The Appellate Division also held that the trial court properly denied Mr. Loury's summary judgment motion on his malpractice counterclaim because reasonable minds could differ on whether Mr. Martin's alleged failures would have changed the second judge's damages award, given the judge already found Mr. Argush not credible, creating genuine factual disputes precluding summary judgment. Also, the Appellate Division held that the trial court properly denied Loury's May 2023 motion to add Joseph Martin individually because the statute of limitations expired in February 2022, six years after the 2016 appellate remand when Mr. Loury incurred new legal costs, and relation back did not apply because Mr. Loury knew Mr. Martin's identity throughout and strategically chose to sue only Martin Law Firm in his 2019 counterclaim.