John Guernsey represents clients in complex commercial litigation and fiduciary litigation, with a strong focus on restrictive covenant and trade secret matters as well as trust and estate matters. John has also served as lead counsel on intellectual property litigation, products liability and complex torts, and employment litigation.
Education
J.D., Harvard Law School, Cambridge, Massachusetts
B.S., with distinction, United States Military Academy at West Point
Recognitions
- Selected as a Leading Lawyer for General Commercial Litigation in Chambers USA, The Client’s Guide to America’s Leading Lawyers for Business (2010–2024)
*This award is conferred by Chambers and Partners. A description of the selection methodology can be found at https://chambers.com/about-us/methodology. No aspect of this advertisement has been approved by the Supreme Court of New Jersey.
- Listed as Best Lawyers in America Philadelphia “Lawyer of the Year” for Litigation – Trusts and Estates (2017)
- *This award is conferred by Best Lawyers. A description of the selection methodology can be found at: https://www.bestlawyers.com/methodology. No aspect of this advertisement has been approved by the Supreme Court of New Jersey.
- Named among The Best Lawyers in America® for Commercial Litigation (2010-2025), Litigation – Labor and Employment (2011-2025), Litigation – Trusts and Estates (2011-2025) by Best Lawyers*This award is conferred by Best Lawyers. A description of the selection methodology can be found at: https://www.bestlawyers.com/methodology. No aspect of this advertisement has been approved by the Supreme Court of New Jersey.
- AV® Preeminent™ Peer Review Rated by Martindale-Hubbell*This award is conferred by Martindale-Hubbell. A description of the selection methodology can be found at www.martindale.com/ratings-and-reviews. No aspect of this advertisement has been approved by the Supreme Court of New Jersey.
- Listed in Pennsylvania Super Lawyers (2005–2024)*This award is conferred by Super Lawyers, part of Thomson Reuters. A description of the selection methodology can be found at: https://www.superlawyers.com/about/selection_process_detail.html. No aspect of this advertisement has been approved by the Supreme Court of New Jersey.
Memberships
American Bar Association
Montgomery County Bar Association
Philadelphia Bar Association
Fellow, American College of Trial Lawyers
State Bar Licenses
Pennsylvania, New Jersey
Court Admissions
U.S. District Ct., E.D. of Pennsylvania
U.S. District Ct., M.D. of Pennsylvania
U.S. District Ct., W.D. of Pennsylvania
U.S. District Ct., District of New Jersey
U.S. Court of Appeals, 3rd Circuit
U.S. Court of Appeals, Federal Circuit