Jack Guernsey Conrad O'Brien Bio Header

John A. Guernsey

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T: 215.864.8066

F: 215.864.0066

Jack Guernsey has served as lead counsel in complex commercial and tort litigation in injunction and trial settings involving contract, intellectual property, construction, class actions, ERISA benefits, estates and trusts, insurance coverage, trade secrets, restrictive covenants, employment discrimination, toxic torts and products liability. He focuses his practice in federal and state courts in Pennsylvania and New Jersey, but has appeared in courts from the Virgin Islands to Texas in representation of clients. For several years, Jack conducted seminars nationally on the management of complex litigation. 

Jack Guernsey has served as lead counsel in complex commercial and tort litigation in injunction and trial settings involving contract, intellectual property, construction, class actions, ERISA benefits, estates and trusts, insurance coverage, trade secrets, restrictive covenants, employment discrimination, toxic torts and products liability. He focuses his practice in federal and state courts in Pennsylvania and New Jersey, but has appeared in courts from the Virgin Islands to Texas in representation of clients. For several years, Jack conducted seminars nationally on the management of complex litigation. 

Jack served five years on Army active duty, including one tour in Vietnam, where he was awarded a Silver Star and a Bronze Star. He served 25 years in the reserve forces, the last 21 in the Delaware Army National Guard, in positions of responsibility, including four years as a brigade commander, before retiring in July 1999.

representative matters

  • Represented executor and trustee in surcharge action alleging mismanagement of testator’s law firm and unreasonable executor/trustee fees. Following nine days of trial, Philadelphia County Orphans Court approved the accounting and executor/trustee fee. The result was not appealed.
  • Obtained preliminary injunction after a two-day hearing against defendants from selling products to any of plaintiff's customers. Individual defendant had previously been employed as plaintiff's vice-president and left plaintiff to form competitive company.
  • Represented defendant start-up company and its three principals in suit in federal district court in Pennsylvania alleging breach of restrictive covenants, misuse of trade secrets and confidential information, and breach of fiduciary duty arising out of defendants’ use of exclusive license for product for which plaintiff previously had had exclusive license. After four days of trial, Jack’s clients prevailed on plaintiff’s motion for preliminary injunction, which the Court denied on a directed verdict.
  • Represented executors in will contest challenging mental capacity of testator and charging executors with exerting undue influence. After a 12-day trial before the Orphans Court of Montgomery County, Pennsylvania, Jack secured a judgment in favor of executors, which was affirmed on appeal.
  • Represented Fortune 500 Company in multi-defendant property damage asbestos case in Circuit Court for Baltimore County. After three months of trial, Jack secured a favorable settlement for his client in a case in which plaintiff obtained substantial verdicts against remaining non-settling defendants.
  • Represented Fortune 500 Company as prior owner of packaging plant in products liability claim brought by injured employee in Superior Court of New Jersey. Jack secured judgment in client’s favor, which was affirmed on appeal. In related action, Jack recovered client’s legal expenses from current owner of packaging plant on indemnity claim.
  • Represented inventor and his companies in patent infringement action in federal district court in Pennsylvania. Following a two-week trial, Jack secured judgment in favor of his clients, which was affirmed on appeal.
  • Represented senior executive in injunction action brought by former employer seeking to enjoin executive from working for competitor. Plaintiff’s request for preliminary injunction was denied and plaintiff then dismissed its case.
  • Represented bank against series of employment-related claims by three plaintiffs in two separate state court actions. Jack obtained summary judgment on all claims in favor of client.
  • Represented a co-trustee in an action seeking to surcharge the two trustees in excess of $13 million and to award punitive damages against Jack’s client.  The trial lasted 17 days before The Honorable John Herron in the Court of Common Pleas, Philadelphia County, Orphans Court Division.  In a decision in favor of Jack’s client, the Court denied both the surcharge and punitive damages claims.