CIVIL VERDICTS - PREMISES LIABILITY * Estate of Joan DeMarco v. The Marquis - Decedent business tenant of apartment/office complex owner murdered by former employee of defendant in violent assault during office burglary. Plaintiff's estate alleged negligent security theory of liability against defendant. Settlement negotiated with responsible insurance company in excess of One Million Two Hundred Thousand ($1,200,000.00) Dollars prior to trial. * Khaled Bakar v. Home Properties, Inc. - Plaintiff was standing on third floor balcony of friend's apartment owned by defendant, when the floor suddenly collapsed causing plaintiff to fall to ground. Plaintiff sustained fractured ribs, non-displaced tibia fracture and herniated disc, which was treated with physical therapy and multiple epidural injections. Montgomery County jury returned a verdict in the amount of Seven Hundred and Sixty Nine Thousand ($769,000.00) Dollars. Plaintiff filed Motion for Delay Damages which was granted and case was settled for Nine Hundred Thousand ($900,000.00) Dollars. * CIVIL VERDICTS - AUTOMOBILE ACCIDENTS * Riccardo v. Kim - Plaintiff sustained fractured cervical vertebrae at C5-6 level which required two surgeries and metal screws, arising from a two vehicle automobile accident. Out-of-court settlement negotiated with responsible insurance carriers in amount of Four Hundred Thousand ($400,000.00) Dollars prior to trial. * Estate of Robert Kane v. Joseph Falco - Decedent killed while passenger in one-car accident where intoxicated driver lost control of vehicle. Wrongful death claim settlement negotiated with responsible insurance company in the amount of Six Hundred and Sixty Thousand ($660,000.00) Dollars prior to trial. * Vinnie Moss v. Baldi Transportation/Erie Insurance Company - Plaintiff awarded Two Hundred Thirty Five Thousand ($235,000.00) Dollars by jury after trial. Defendant trucking company bankrupt and uninsured. Uninsured motorist claim settlement negotiated with plaintiff's insurance company in the amount of Two Hundred Thousand ($200,00.00) Dollars. * CIVIL VERDICTS - LIQUOR LIABILITY * Gerald & Irene Kane v. Dublin Wine and Spirits and Commonwealth of PA - Plaintiff husband and wife sustained multiple injuries in head-on collision with drunk driver. Husband-plaintiff sustained head injury resulting in brain hemorrhage and coma, with substantial recovery. Wife-plaintiff sustained broken ankle. Out-of-court settlement successfully negotiated against defendants prior to trial. Husband's claim - Two Hundred Forty Thousand ($240,000.00) Dollars. Wife's claim - Ninety Thousand ($90,000.00) Dollars. (Bucks County)* Edward Pisarek v. Adriatric Club - Plaintiff police officer assaulted while on duty by intoxicated bar patron skilled in martial arts. Plaintiff sustained permanent partial hearing loss and multiple lacerations. Non-jury trial verdict in favor of plaintiff and against defendant in amount of One Hundred Fifty Thousand ($150,000.00) Dollars. (Philadelphia County) CIVIL VERDICTS - PRODUCT LIABILITY* Keith Rosenberger v. Galoob Toys, Inc. - Plaintiff sustained temporary partial loss of vision in one eye with increased risk of future glaucoma, when struck in eye by defendants' children's toy, while plaintiff demonstrated newly purchased toy for child. Out-of-court settlement successfully negotiated against defendants in the amount of One Hundred Fifty Thousand ($150,000.00) Dollars prior to trial. (Montgomery County)* Raymond Cost v. Caterpillar, Inc. - Plaintiff sustained partial amputation of his lower leg, when his foot was crushed in an unguarded pinchpoint of rotating couplings inside engine area, while plaintiff was performing maintenance of defendant's heavy trash compactor/metal shearer. Out-of-court settlement successfully negotiated against defendant in the amount of Four Hundred Seventy Five Thousand ($475,000.00) Dollars prior to trial. (Montgomery County)


Attorney John I. McMahon, Jr.


Telephone: (610) 272-9502

Office Location: 21 West Airy Street Norristown, PA 19401

Bar Admissions: Pennsylvania, United Stated District Court for the Eastern and West Districts of Pennsylvania.

Education: Widener University Law School


During the last thirty-two years, John I. McMahon, Jr. has earned a well-documented and unmatched record of exceptional courtroom results throughout Eastern Pennsylvania, in high profile criminal defense cases and serious personal injury claims. He is always well-prepared and aggressive in the courtroom, and compassionate and patient with clients.

Mr. McMahon began honing his formidable skills as a trial lawyer during his three year career as an Assistant District Attorney in Montgomery County where he primarily prosecuted homicide and narcotics cases. Thereafter, he joined his father John McMahon, Sr. (1959-2004) in private practice.

Criminal Defense Attorney

Mr. McMahon has successfully defended clients in serious criminal cases in both state and federal courts, including Homicide, Sexual Offenses, Theft Offenses, Narcotics, Mail Fraud, Embezzlement, Money Laundering and a Not Guilty verdict in a recent Lancaster County Death Penalty- First Degree Murder case. He has achieved Not Guilty verdicts in over 100 jury trials throughout most of the counties within eastern Pennsylvania, as well as throughout the entire Commonwealth.

In his over thirty years in practice, Mr. McMahon has observed that a large majority of defendants suffer from some form of substance abuse and or mental health issues. For addicted clients who are receptive to treatment, Mr. McMahon zealously advocates for treatment versus incarceration in the early stages of the case. Click here to read more: Pennsylvania Criminal Defense Attorney, John I. McMahon, Jr. Advocates For Treatment Versus Jail For His Addicted Defendants.

Personal Injury Lawyer

Although Mr. McMahon is well-known for his successes as a criminal defense attorneys, he has an equally remarkable record of exceptional results for clients in civil personal injury cases both in the courtroom and through out-of-court settlements. He has zealously represented clients with civil personal injury claims in Wrongful Death, Automobile Accident, Premises Liability, Liquor Liability and other serious injury claims in which he has achieved substantial settlements/verdicts - some within the millions of dollars, throughout Eastern Pennsylvania.


Mr. McMahon obtained his Juris Doctor from the Widener University Delaware Law School and graduated from Mt. St. Mary's College in Emmitsburg, Maryland, with a Bachelor of Science degree in Business and Finance.

Other Interests

Mr. McMahon is a Civil War buff. Following the September 11th tragedy, he, and other patriotic Civil War re-enacters, marched from Philadelphia, Pennsylvania to Brooklyn, New York in a show of support for the fallen heroes of the New York Fire Department. He is an avid fan of baseball and a classic rock aficionado.