Philadelphia, PA - (215) 587-9400
Cherry Hill, NJ - (856) 429-6331
Media, PA - (610) 892-2732


John P. Morgenstern is a partner and shareholder with Deasey, Mahoney & Valentini, Ltd. where he represents governmental and private sector clients in federal and state courts and agencies in Pennsylvania, New Jersey and throughout the nation. He maintains an AV Preeminent rating with Martindale Hubbell.

John and his team represent architects, engineers and accountants in professional liability matters as well as governmental entities, including police departments, in cases involving alleged civil rights violations. He represents employers in employment and labor disputes in additional to matters involving commercial and general liability and insurance coverage issues.   

John served in the U.S. Army JAG Corps overseas and was awarded the Bronze Star Medal in Baghdad in February 2004. He also deployed to the Balkans in support of NATO peacekeeping operations. John served as Officer in Charge of the Patton Legal Center, Trial Counsel, Part-time Military Magistrate Judge, Chief of Claims, Article 32 Investigating Officer and Ethics Counselor for V Corps in Heidelberg, Germany.

John enjoys running, swimming and spending time with his wife and their two children.


  • Lehigh University (B.A. 1994)
  • Widener University School of Law (J.D. 1997 – President, Moot Court Honor Society)
  • Judge Advocate General’s School of the U.S. Army (First Lieutenant – 2002)


  • Deasey, Mahoney & Valentini, Ltd. (2008–Present)
  • Sweeney & Sheehan, P.C. (2001–2008 except active military duty)
  • U.S. Army Judge Advocate General’s (“JAG”) Corps (2002–2005)
  • Dolan and Dolan, P.A. (1997–2001)
  • Habitat for Humanity, Northwest New Jersey Chapter, pro bono General Counsel (1998–2000)

Professional Affiliations

  • Defense Research Institute (Appointed to the MSP Act Task Force, 2011; Member of the Employment Law, Government Liability, Product Liability, and Professional Liability committees)
  • New Jersey Bar Association (Employment and Labor Law Committee)
  • Pennsylvania Bar Association
  • Philadelphia Bar Association
  • Veterans of Foreign Wars
  • American Legion
  • Director, Pro Vet International Gifts and Scholarships
  • Judge Advocate's Association

Awards and Designations

  • Bronze Star Medal, awarded in Baghdad, Iraq, February 2004
  • Meritorious Service Medal, awarded in Heidelberg, Germany, June 2005
  • NATO Commanding General’s Commendation, awarded in Sarajevo, Bosnia-Herzegovina, April 2005
  • The Order of Barristers, inducted May 1997
  • U.S. Army Commendation Medal, awarded in Sarajevo, Bosnia-Herzegovina, April 2005

Publications & Lectures

  • “Congress Provides Additional Breaks to Military Members and Families under the Servicemembers Civil Relief Act,” March 2007

  • “The Continuing Evolution of USERRA (Uniformed Services Employment and Reemployment Rights Act),” The Job Description (Defense Research Institute Employment Law Committee newsletter), Fall 2007

  • Military Issues in Civil Litigation, Pennsylvania Defense Institute Continuing Legal Education, March 4, 2006

  • Observations from Behind the Wall in Iraq, International Human Rights Lecture, University of Pennsylvania School of Law, April 3, 2006  

  • “Practitioner’s Guide to the Medicare Secondary Payer Act,” an overview of Medicare set-aside arrangements and Medicare Secondary Payer reports (Deasey, Mahoney & Valentini), February 2009

  • “Settler Beware: Navigating the Amendment to the Medicare Secondary Payer Act” (Defense Research Institute committee newsletter), 2009

  • Strategic Use of the Motion to Dismiss and Preliminary Objections, Pennsylvania Defense Institute Continuing Legal Education, May 17, 2007

  • “Supreme Court Clarifies Triggering Event for Title VII Pay Discrimination Claims,” The Voice (Defense Research Institute newsletter) June 13, 2007

  • “Supreme Court Expands Pool of Retaliation Plaintiffs in Federal Courts,” March 2007

  • “Welcoming Home the Service Member Employee: A Primer on the Uniformed Services Employment and Reemployment Rights Act,” June 2007

Attorney News

Phone: (215) 587-9400
Fax: (215) 587-9456
Email John P. Morgenstern
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Bar Admissions

  • U.S. Supreme Court (2001)
  • U.S. Circuit Court of Appeals for the Third Circuit (1998)
  • U.S. Army Court of Criminal Appeals (2002)
  • U.S. District Court for the Eastern District of Pennsylvania (2007)
  • U.S. District Court for the District of New Jersey (1997)
  • U.S. District Court for the Middle District of Pennsylvania (2005)
  • Pennsylvania (1997)
  • New Jersey (1997)

Practice Areas

ABOUT OUR FIRM | PRACTICE AREAS | LEGAL TEAM | MEDIA CENTER | CONTACT US | NEWSLETTERS Suite 3400 - 1601 Market St.- Philadelphia, PA 19103 - Telephone: (215) 587-9400 - Facsimile: (215) 587-9456
923 Haddonfield Road, Suite 300, Cherry Hill, NJ 08002 - Telephone: (856) 429-6331 - Facsimile: (856) 429-6562
103 Chesley Drive - Lafayette Building - Suite 101 - Media, PA 19063 - Telephone: (610) 892-2732 - Facsimile: (215) 587-9456
appellate / automotive liability / bad faith / civil rights / class action / construction defects / construction site injury / crane and rigging litigation / cyber security liability & coverage / environmental toxic tort litigation and coverage / excess insurance litigation / fire and arson claims / governmental liability / immigration reform litigation / insurance coverage / labor and employment law / liquor liability/dram shop / premises liability / products liability / professional liability / social services and human services claims / subrogation / transportation

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