Jonathan Ziss is a partner in the firm's Philadelphia office. He has accumulated a significant amount of trial and appellate experience in the state and federal courts as well as before administrative tribunals. Jonathan concentrates his practice in the area of commercial litigation, aviation litigation, and professional liability. He has written articles on the subject of fiduciary responsibility and professional standards, and he has lectured accountants, architects, attorneys, bankers and fiduciaries on topics related to professional risk and claims management.

Jonathan has represented many local, regional and national accounting firms in a wide variety of matters and in a number of forums including all forms of ADR. In professional negligence matters, he has represented accountants in lawsuits brought by former clients; by purchasers or sellers in disputes arising out of business combinations; by factors, banks and other lenders; by creditors in bankruptcy and bankruptcy trustees; and by other affiliated professionals. In addition, Jonathan is frequently called upon to represent accountants in investigations by federal, state and local authorities, including the Internal Revenue Service, the FBI and the Department of Labor, as well as investigations by bankruptcy trustees and creditors’ committees. He has worked with accounting firms preparing for grand jury appearances. 

Jonathan has also counseled accounting firms on questions concerning ethics and professional standards, involving client engagements and disengagements, record production requests, subpoena compliance, conflicts of interest, auditor independence, privilege, confidentiality, and the unauthorized practice of law, to mention but a few. Outside of the E&O arena, he has counseled and represented accountants on matters relating to covenants not to compete, employment liability, and other business and internal matters.

Throughout his career, Jonathan has represented regional, national and international air carriers, as well as under wing service providers, municipal authorities, general aviation owners and operators, as well as fixed base operators, in connection with property and casualty liability litigation. In addition to handling disputed matters, he counsels commercial airlines in connection with industry-related consumer compliance and contractual matters.

Jonathan counsels clients and litigates, arbitrates, and mediates commercial disputes in a wide range of industries, from healthcare to hospitality. He is frequently called upon to handle matters involving employment claims, covenants affecting post-employment competition and the use of confidential and proprietary business information, creditors’ rights, indemnification, and other contract-based claims.

Professional Affiliations
  • American Bar Association: Member, Tort and Insurance Practice Section, Aviation Litigation Committee
  • Professional Liability Defense Federation: Current Assistant Vice President
  • Professional Liability Underwriting Society (PLUS): Immediate Past Chair, PLUS Mid-Atlantic, Steering Committee
  • Pennsylvania Defense Institute
  • Claims and Litigation Management Alliance: Current Lead Chair, Professional Liability Committee
  • Defense Research Institute: Member, Aviation Law Leadership Committee 
Honors
  • Selected for inclusion in Pennsylvania Super Lawyers (Metro - Professional Liability: Defense) 
Admitted to Practice
  • Pennsylvania
  • New Jersey 
  • U.S. District Courts for the Eastern and Middle Districts of Pennsylvania
  • U.S. District Court for the District of New Jersey
  • U.S. Court of Appeals for the Third Circuit
Education
  • Franklin and Marshall College, B.A., cum laude, 1981 (Elected Phi Beta Kappa)
  • Villanova University School of Law, J.D., 1984 (Staff Member, Villanova Law Review)
Publications/Presentations