Jonathan S. Ziss: Lawyer with Goldberg Segalla LLP

Jonathan S. Ziss

View Jonathan S. Ziss 's Martindale-Hubbell Connected Profile
Philadelphia,  PA  U.S.A.

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AV® Preeminent

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Practice Areas

  • Professional Liability
  • Aviation Litigation
  • Commercial Litigation
  • Cyber Risk and Social Media
  • Accountants
Contact InfoTelephone: 267.519.6820
Fax: 267.519.6801
University Franklin and Marshall College, B.A., cum laude, 1981 Elected Phi Beta Kappa
Law SchoolVillanova University School of Law, J.D., 1984 Staff Member, Villanova Law Review
Admitted1984, Pennsylvania; 1985, 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

Professional Affiliations

•American Bar Association: Member, Tort and Insurance Practice Section, Aviation Litigation Committee
•Professional Liability Defense Federation: President
•Professional Liability Underwriting Society (PLUS): Immediate Past Chair, PLUS Mid-Atlantic, Steering Committee
•Pennsylvania Defense Institute
•Claims and Litigation Management Alliance: Lead Chair, Professional Liability Committee
•Defense Research Institute: Member, Aviation Law Leadership Committee

BornNewark, New Jersey, March 30, 1959

Jonathan Ziss is a partner in Goldberg Segalla's Philadelphia office. He is a member of the firm's Professional Liability Practice Group, chairs the firm's Aviation Litigation Practice Group, and is a member of its Commercial Litigation and Cyber Risk and Social Media Practice Groups.

Jonathan devotes much of his practice to the representation of professionals, including accountants, attorneys, bankers, design professionals, insurance agents/brokers, and fiduciaries, in administrative and civil proceedings. He counsels clients and litigates, arbitrates, and mediates commercial disputes in a wide range of industries, from healthcare to hospitality. He also manages compliance and loss mitigation campaigns in the aftermath of data breaches.

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.

In the field of aviation litigation, Jonathan has represented regional, national, and international air carriers, as well as under wing service providers, municipal authorities, general aviation owners and pilots, and 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's transportation litigation experience also includes handling high-profile cases for the Southeastern Pennsylvania Transportation Authority (SEPTA) involving rail and bus accidents. In addition, he has handled recreational boating and trucking claims.

Jonathan serves as a chair of the CLM's Professional Liability Committee as well as President of the Professional Liability Defense Federation (PLDF), and he is a past chair of the Professional Liability Underwriting Society (PLUS) Mid-Atlantic Steering Committee. Jonathan is a frequent author and lecturer on the subject of professional standards, professional liability risk, and aviation liability. He has been quoted in, Dow Jones News Service, Law360, The Legal Intelligencer, and Reuters, among others.


•Martindale-Hubbell Peer Review Rating: AV Preeminent; Philadelphia's Top-Rated Lawyers, 2014
•Pennsylvania Super Lawyers, 2012-2015


• Claims Against Auditor and All Others Dismissed in $40M Securities Class Action
June 22, 2015
• First Impressions Are Lasting: New Defense Available in Delaware for Auditors and Other Third Parties in Corporate Misconduct Claims
March 2015


• Eleven Goldberg Segalla Attorneys Recognized in 2015 Pennsylvania Super Lawyers
June 1, 2015
• Goldberg Segalla Attorneys Recognized in 2014 Pennsylvania Super Lawyers
May 23, 2014
• Goldberg Segalla Attorneys Listed in 2013 Pennsylvania Super Lawyers
May 17, 2013
• Five Goldberg Segalla Attorneys Named in Pennsylvania Super Lawyers
June 18, 2012


• Goldberg Segalla Attorneys Honored for Pro Bono Work
May 12, 2015
• Jonathan S. Ziss Elected President of Professional Liability Defense Federation
September 2014


• Professional Liability Matters


• Panelist, “Drones in the Construction Industry: Regulatory Compliance and Risk Mitigation, ” Associated General Contractors of America IT Forum, Chicago, July 30, 2015
•Author, “ Know When to Consult Your Professional Liability Lawyer, ” Pennsylvania CPA Journal, Summer 2015
•Presenter, Claims and Litigation, ACI's Claims and Litigation Conference, New York, NY, June1, 2015
•Presenter, MedPL: Mo' Money, Mo' Problems: Do Limits Increase Claims Values?, 2015 Medical PL Symposium, Atlanta, GA, April 29, 2015
•Featured in “ Jonathan Ziss on the Correlation Between Limits and Claims, ” PLUS Blog, April 28, 2015
•Quoted in “ New Defense for Delaware Auditors in Corporate Misconduct Claims, ” Accounting Today, April 23, 2015
•Panelist, Hot Data Breach Litigation Issues, 4th Annual National Cyber Liabilities Insurance ExecuSummit, Uncasville, CT, April 21, 2015
•Presenter, Recent Developments in Aviation Law, SMU Aviation Law Symposium, March 25, 2015
•Author, “ Cyber Liability Exposure for CPAs, ” Pennsylvania CPA Journal, Spring 2015
•Author, The Illogic of the Supposed Arguments Against the Use of Engagement Letters, Pennsylvania CPA Journal, Winter 2014
• Author, Drone Regulation Would Create Need for Liability Insurance, Business Insurance, November 23, 2014
• Presenter, “Managing the Ever Increasingly Regulatory Environment, ” Lemme Best Practices Forum 2014, Chicago, IL., September 10-12, 2014
• Presenter, “Professional Risk Management for the Tax Practitioner, ” PICPA 117 th Annual Convention, Orlando, FL., June 23-25, 2014
•Quoted in “ Wilson Sonsini Scandal Brings Unwanted Glare to M&A Group, ” Law360, September 17, 2014
•Author, “ Predict and Recognize the Risks in Tax Engagements, ” Pennsylvania CPA Journal, Fall 2014
•Author, “ Strict Liability for International Aviation Disasters, ” For the Defense, Defense Research Institute, August 2014
•Author, “When Teaming With Other Professionals, Play Your Position, ” Pennsylvania CPA Journal, Summer 2014
•Quoted in “4 Ways Transactional Attorneys Can Avoid Malpractice Claims, ” Law360, June 11, 2014
•Moderator, In-House Panel: The View From the Airline Carriers and Manufacturers, and Panelist, The Present and Future Landscape of Drone Usage, ACI Aviation Claims and Litigation Summit, Chicago, May 2014
• Panelist, “Causation in Professional Liability Claims: A Sword and Shield, ” 2014 Professional Liability & eDiscovery Conference, Orlando, FL., January 24, 2014
•Author, “Ask the Insurance Experts: Does A Work of Art That Cannot Be Sold Have Value?” Chubb Collectors, Fall 2013
•Quoted in “Wachtell Malpractice Claims A Tough Sell For Icahn's CVR, ” Law360, October 30, 2013
•Presenter, “Fraud Detection: That's What CPAs Are Hired to Do, Right?” Professional Liability Defense Federation Annual Meeting and CLE/CEU Presentation, Chicago, Illinois, October 9-11, 2013
•Quoted in “FDIC Renews Effort to Sue Auditors Over Colonial Bank Failure, ” Dow Jones News Service, September 25, 2013
•Author, “Practitioners: Beware the Family Affair, ” Pennsylvania CPA Journal, Fall 2013
•Presenter, “Ethics and Other Issues - An Update, ” National Association of Certified Valuators and Analysts (NACVA), Edison, New Jersey, September 20, 2013
•Quoted in “Asiana Crash Reminds Insurers of Potential for Worse Aviation Losses, ” BestWeek, July 24, 2013
•Author, “Social Media Takes You to New Vistas, But Tread Carefully, ” Pennsylvania CPA Journal, Summer 2013
•Featured in “Legal Implications of Social Media, ” PICPA Beyond the Copy, May 2013
•Co-Author, Transactional Insurance: How Better to Manage Litigation Than to Prevent It? Litigation Management, Spring 2013
•Co-Author, “Who Owns the Working Papers, ” Pennsylvania State Board of Accountancy Newsletter, February 2013
•Author, “Does Liability Protection Mean Never Having to Say You're Sorry?” Pennsylvania CPA Journal, Winter 2013
•Quoted in “A Tale of Two Lawsuits - PricewaterhouseCoopers and Colonial Bank, ”, November 10, 2012
•Quoted in “Insurance May Provide Little Relief for Knight Capital Losses, ” Reuters, August 4, 2012
•Author, “Still Crazy After All These Years: Lateral Moves and Non-Compete Agreements, ” American Agent & Broker, August 2012
•Author, “When Moonlighting Becomes Your Problem, ” Pennsylvania CPA Journal, Spring 2012
•Co-Author, “Who Are You Calling Miscellaneous? Professional Liability Insurance for This Booming Service Sector, ” Litigation Management, Winter 2012
•Author, “Ask the Right Questions: Choosing Professional Liability Insurance, ” Pennsylvania CPA Journal, Winter 2012
•Podcast Interview, “The Need for Professional Liability Insurance, ” Pennsylvania Institute of Certified Public Accountants, November 2011
•Author, “Bill Designed to Protect Travelers Could Prove Difficult to Implement, ” Travel Weekly, November 14, 2011
•Author, Keeping Secrets, Pennsylvania CPA Journal, Fall 2011
•Quoted in “Aviation Lawyers Say Airline Claims Up, Air Crash Cases Steady, ” The Legal Intelligencer, August 2, 2011
•Presenter, Medicare Set-Asides in Personal Injury Litigation Seminar, National Business Institute, Philadelphia, June 28, 2011
•Presenter, “Pennsylvania Supreme Court Clarifies Key Auditor Defense to Claims Based on Management Fraud, ” 114th Annual Meeting of the Pennsylvania Institute of Certified Public Accountants, Lake Buena Vista, FL, June 20, 2011
•Quoted in “Professional Liability a Hot Area, Even as Med Mal Claims Cool, ” The Legal Intelligencer, May 31, 2011
•Author, “Recognize and Avoid the Unauthorized Practice of Law, ” Pennsylvania CPA Journal, Spring 2011
•Author, “FDIC Professional Liability Group Set to Pursue Audit Firms, ” The Legal Intelligencer, February 8, 2011
•Presenter, “Professional Liability in Business Valuation Engagements, ” Pennsylvania Institute of Certified Public Accountants, 2010 Business Valuation Conference, November 1, 2010, Harrisburg, PA
•Presenter, “How to Identify and Manage Malpractice Risks in Your Role as an Expert Witness, ” National Association of Certified Valuation Analysts (NACVA) Institute of Business Appraisers (IBA) 2010 Annual Consultants' Conference, Meeting of The Minds in Miami, June 2 -5, 2010, Miami Beach, FL
•Presenter, “Mock Trial: Litigation Boot Camp for Forensic Financial Experts, ” National Association of Certified Valuation Analysts, sponsors of the Certified Forensic Financial Analyst (CFFA) designation, Loews Hotel, Philadelphia, 2009
•Author, “Use a Proper Release to Avoid Future Traps, ” Pennsylvania CPA Journal, Summer 2009
•Author, “Avoid Sitting in Two Boats at Once, ” Pennsylvania CPA Journal, Winter 2009
•Presenter, “Elder Care - Professional Liability Issues for CPAs, ” Pennsylvania Institute of Certified Public Accountants Greater Philadelphia Chapter in Cooperation with the Bar Committee, Philadelphia, 2008
•Presenter, “The Importance of Due Diligence for Art Collectors, ” 15th Anniversary Sculpture Objects & Functional Art Fair (SOFA), Chicago, 2008
•Presenter, “The Rising Standard for IT Competency - Why E-Discovery Is Only the Edge of the Wedge, ” Forensic and Litigation Services Committee of the Pennsylvania Institute of Certified Public Accountants, Philadelphia, 2008
•Presenter, “Electronic Discovery and Data Retention Programs, ” CPA Club of Greater Wilmington, Wilmington, DE, 2008
•Presenter, “Mock Trial: Beware the Not-For-Profit Executive - A Criminal Indictment, ” Pennsylvania Institute of Certified Public Accountants Greater Philadelphia Chapter in Cooperation with the Bar Committee, LaSalle University, Philadelphia, 2007
•Presenter, “Electronic Discovery and Data Retention Programs - New Obligations and New Exposures, ” PLUS Education Event - Mid-Atlantic Chapter, Wilmington, DE, 2007
•Author, “Reminders Help Client Relations, ” Pennsylvania CPA Journal, Fall 2007
•Author, “Trouble Can Be Heard in a Whisper or a Scream, ” Pennsylvania CPA Journal, Summer 2007
•Author, “Keeping Your Thoughts to Yourself, ” Pennsylvania CPA Journal, Spring 2007
•Presenter, Legal Issues for Pennsylvania Architects - Identifying the Standard of Care, ” Half-Moon Seminars (CPE Accredited), Fort Washington, PA, January 2007
•Author, “Weeding Out the Problem Client, ” Journal of the Pennsylvania Institute of Certified Public Accountants, Summer 2006
•Presenter, “Arbitration Workshop, ” Forensic and Litigation Services Committee of the Pennsylvania Institute of Certified Public Accountants, Philadelphia, 2001
•Presenter, “Fiduciaries' Responsibilities With Regard to Art in Estates and Trusts, ” American Bar Association Section of Real Property, Probate and Trust Law, Chicago, 2001


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First Impressions Are Lasting: New Defense Available in Delaware for Auditors and Other Third Parties in Corporate Misconduct Claims
Seth L. Laver,Jonathan S. Ziss, April 17, 2015
In a case of first impression before the Delaware Chancery Court, the defense of in pari delicto was applied in favor of an auditor to defeat claims brought by the receiver of several insolvent insurance entities. This decision sets important and favorable precedent for the defense of accounting...

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Office Information

Jonathan S. Ziss

1700 Market Street, Suite 1418
PhiladelphiaPA 19103-3907


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