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 Erin C. Lentz-McMahon


Telephone: (610) 272-9502

Office Location: 21 West Airy Street Norristown, PA 19401

Bar Admissions: Pennsylvania, New Jersey, United States Eastern District Court of Pennsylvania and United States Court of Appeals for Third Circuit

Education: Juris Doctorate from Widener University School of Law, Harrisburg, Pennsylvania campus, and graduated cum laude with a Bachelor of Arts from Gannon University, a private Catholic school in Erie, Pennsylvania


Attorney Erin Lentz McMahon is a compassionate and zealous advocate for those who need result-oriented legal assistance.  She has specialized training as a mediator where she learned how to effectively communicate with those in conflict.  Her legal experience not only includes extensive courtroom advocacy, including jury trials, but she is an accomplished legal writer who successfully drafts legal documents on behalf of her clients with a deep understanding of the importance of making strong legal arguments, objections and staying up-to-date on the current law.

She joined as a partner at the firm of McMahon, McMahon & Lentz in 2010 after operating her solo law practice from 2008-2010.  The firm has evolved into McMahon, Lentz & Thompson where Mr. McMahon, Ms. Lentz McMahon and Mr. Thompson have a collaborative approach to assisting their clients in criminal and personal injury cases.

Her passion is analyzing constitutional issues arising from violations of the United States and Pennsylvania Constitutions.  Our Constitution is the foundation of an individual’s rights that must be vigorously protected to ensure that there is law and justice for all.

Ms. Lentz McMahon served as a judicial law clerk for the Pennsylvania Supreme Court and trial courts in both Montgomery and Adams County Court of Common Pleas where she gained invaluable knowledge and experience knowing how the court system operates and what judges are looking for when litigants appear before the Court.  She is also a former prosecutor who serve din the appellate division at the Montgomery County Office of District Attorney.  In addition, Ms. Lentz McMahon volunteered to represent indigent persons through the Montgomery County Legal Aid where she earned a pro bono service award and also served as a child advocate for the Montgomery County Child Advocacy Project.

Other Interests

Ms. Lentz McMahon is an avid paper crafter. She is an Independent Stampin’ Up! Demonstrator who has a Facebook group called “Creative Roses” and YouTube channel where she posts some of her creations. She is married to her law partner John McMahon, Jr. and is a step mother to three adults, and a devoted dog mom to Lagertha.