Peter L. MacIsaac is a partner with Chasan Lamparello Mallon & Cappuzzo, PC and the Chair of the Personal Injury/Medical Malpractice Department.  He is certified by the Supreme Court of New Jersey as a Civil Trial Attorney and is recognized as one of the leading medical malpractice and catastrophic injury attorneys in New Jersey.  Peter’s practice focuses on helping patients who have been harmed by preventable medical errors.  He has recovered substantial awards and settlements in matters involving many different fields of medicine.

Many of these patients have needlessly suffered wrongful death or been unfairly deprived of the opportunity to treat and cure their terminal illness.  Several have ended up in a comatose like state or have been permanently inflicted with cerebral palsy or other forms of brain damage, as a result of medical error.  As a result of his tireless advocacy on behalf of victims, Peter was appointed Vice Chairman of the NJ State Bar Association’s Special Committee on Medical Malpractice.

In addition to representing patients damaged by medical negligence, Peter also represents victims of general negligence, including those injured by driver error, as well as dangerous premises and products.  Peter also represents victims of sexual abuse including minors, disabled persons and their families.  In 2014, he recovered the largest individual reported public settlement in New Jersey for sexual molestation of a child.  Peter’s client was abused by a Priest within the Archdiocese of Newark as a boy.

Peter has tried cases before judges and juries including medical malpractice matters (including wrongful death), auto and premises liability, estate commercial/contractual (fraudulent transfer) and real estate matters.  

Peter has argued before the Appellate Division of the Superior Court of New Jersey; the Supreme Court of New Jersey; the United States District Court for the District of New Jersey; and the United States Court of Appeals for the Third Circuit.

Peter was named a Rising Star® by New Jersey Super Lawyers® for his efforts representing victims of professional medical negligence.  He was also named one of the top 100 Trial Lawyers by the National Trial Lawyers, Top 100 Trial Lawyers.

Peter also represents parties in commercial, chancery and estate matters.  In 2005, the United States Court of Appeals for the Third Circuit adopted Peter’s arguments for its precedent setting interpretation of the Computer Fraud and Abuse Act (“CFAA”).  See Party City v. Celebration, et al., 428 F. 3d 504, C.A.3 (N.J) (No. 04-4254), wherein Peter successfully defended an individual charged with computer hacking the business of a competitor to steal trade secrets.  He argued this case before the Federal District Court for the State of New Jersey and the United States Court of Appeals for the Third Circuit. The Precedential Opinion is available on-line at http://www.ca3.uscourts.gov/opinarch/044254p.pdf.

Peter worked directly under one of the firm’s founding members, Joel A. Leyner, Esq., before assuming primary responsibility for the firm’s catastrophic injury and medical malpractice cases.  During his time as an associate, Peter had primary responsibility for the firm’s medical malpractice work and was instrumental in the successful resolution of many, resulting in a large amount of multi-million dollar verdicts and settlements.  Peter has procured the following compensation for his clients among other recoveries:

  • $8,600,000 auto accident/wrongful death
  • $4,500,000 industrial accident
  • $1,850,000 for a misdiagnosed spinal injury
  • $1,500,000 on behalf of a near drowning victim
  • $1,500,000 on behalf of a woman who slipped and fell on ice in a commercial parking lot
  • $1,100,000 for the parents of a patient fatally injured by surgical error
  • $1,050,000 for a husband whose wife died as a result of a negligent failure to diagnose primary peritoneal cancer
  • $1,050,000 for the victim of a construction site accident
  • $1,000,000 for a fatal delay in a diagnosis of lung cancer
  • $1,000,000 for the victim of nursing negligence which allowed a fatal pressure sore to form on the patients sacrum
  • $930,000 auto
  • $900,000 for a victim of childhood sexual abuse by clergy
  • $800,000 for food poisoning
  • $800, 000 for nerve damage caused by improperly performed surgery
  • $750,000 from a bar for the victim of its negligent service of alcohol
  • $500,000 for a slip and fall
  • $500,000 for the victim of a negligently performed surgery to remove colon cancer


Does the Patients First Act Really put Patients First? Recent Case Developments Concerning Medical Affidavits of Merit. NJ Lawyer Magazine, June 2016 http://www.chasanlaw.com/tasks/sites/chasan/assets/image/MacIsaac.pdf


NJICLE   Scafidi Revisited – What is the Latest You Need to Know About “But For and Substantial Factor” Causation. November 2016

Peter and his wife Amy live in Upper Saddle River, NJ, and are the proud parents of two boys and a girl.  Peter coaches his children in various sports.