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Marshall DenneheyShareholder; Chair, Privacy And Data Security; Chair, Intellectual Property, Technology And Media Litigation
David J. Shannon
Pro

David J. Shannon

4.4
1 review

2000 Market Street, Suite 2300, Philadelphia, PA 19103

COVID-19 Task Force 2020, Privacy and Data Security, Intellectual Property, Technology and Media Litigation and 3 more

About David J. Shannon

David chairs both the Privacy and Data Security Practice Group and the Intellectual Property, Technology and Media Litigation Practice Group. He concentrates a substantial portion of his practice on privacy law, data breaches, intellectual property, copyright and trademark infringement, as well as trade secret, trade dress technology and media related litigation. David is experienced defending privacy and intellectual property cases venued throughout the United States and has been litigating cases in federal and state courts since 1994. David is a national and international featured speaker at privacy and data security conferences and seminars. His presentations focus on legal issues and emerging trends in the insurance industry with an emphasis on all areas of privacy, data breach and data security.

David additionally represents design professionals in a variety of construction industry related claims. He has extensive experience representing architects, engineers, surveyors, land developers, commercial property owners, general contractors, subcontractors and commercial landscapers. David has defended clients in cases that involved claims for design errors and omissions and other contractual and negligence claims. Over the past 25 years, he has tried a number of bench trials, jury trials, and arbitrations.

Honors & awards

Legal 500 Philadelphia Legal Elite, Intellectual Property
2025-2026

Pennsylvania Super Lawyers
2005

Year joined

2005

Thought Leadership

Marshall Dennehey Attorneys Once Again Recognized in The Legal 500 Philadelphia Legal Elite

Appellate Advocacy & Post-Trial Practice
Intellectual Property, Technology & Media Litigation
Privacy & Data Security
February 25, 2026
Marshall Dennehey announced today that two Philadelphia shareholders-John J.

Identity Theft Resource Center Report Reveals Rising Data Breaches Despite Drop in Mega Breaches

Philadelphia - Headquarters
Privacy & Data Security
February 19, 2026
The Identity Theft Resource Center (ITRC), a well-known, non-profit identity theft and fraud prevention organization, recently released its 2025 annual data breach report with significant findings for the data breach field.

Article Title Managing Cybersecurity Threats in 2025 - Episode 2 - Beyond the Breach: Remediation vs. Forensic Investigation

Philadelphia - Headquarters
Privacy & Data Security
December 1, 2025

Managing Cybersecurity Threats in 2025 Season 3 Episode 2

Philadelphia - Headquarters
Privacy & Data Security
December 1, 2025

Marshall Dennehey Attorneys and Practice Recognized in The Legal 500 Philadelphia Legal Elite

Appellate Advocacy & Post-Trial Practice
Intellectual Property, Technology & Media Litigation
June 25, 2025
Marshall Dennehey announced today that two Philadelphia shareholders-John J. Hare and David J.

Classes/Seminars Taught

PLUS Podcast: Managing Cybersecurity Threats in 2025, Episode 2, Beyond the Breach: Remediation vs. Forensic Investigation, December 2025

PLUS Podcast: Managing Cybersecurity Threats in 2025, Episode 1, ' Ransomware, Business Email Compromise, AI and The Increasing Sophistication of Cyber Threat Actors,' July 2025

PLUS Podcast: Managing Cybersecurity Threats in 2024, Episode 3, Restoration After The Data Breach, December 2024

PLUS Podcast, Managing Cybersecurity Threats in 2024, Episode 2: SEC Amendment's Impact on Compliance and Reporting, July 2024

PLUS Podcast: Managing Cybersecurity Threats in 2024, Episode 1: The Persisting Threat of Ransomware, February 27, 2024

PLUS Podcast: Managing Cybersecurity Threats in 2023. Episode 2: The Current State of Ransomware Attacks in 2023 . April 2023

Critical Infrastructure - A Global View on Cyber Risk and Systemic Threats, ILG 360 London Annual Conference 2023, March 15, 2023

PLUS Podcast: Managing Cyber Security Threats in 2023. Episode 1: Cryptojacking - New Risks For Carriers and Their Insureds. March 2023

Business Email Compromise & Wire Transfer Fraud - Evolving Trends and Cyber Crime, Marshall Dennehey Client Webinar, Presented to Multiple Clients, 2022

Ransomware Attacks: An Ongoing Global Threat, Marshall Dennehey Client Presentation, Presented to Multiple Clients, 2022

Ransomware Attacks: An Ongoing Global Threat, ILG Virtual Conference, March 31, 2022

Cybersecurity: Crucial for a Law Firm’s Survival, Moderator, Philadelphia Association of Defense Counsel, November 16, 2021

Civil Litigation Updates in COVID-19 Litigation - Where Do We Stand One Year Later? Marshall Dennehey Webinar, May, 2021

Ransomware Attacks: An Ongoing Global Threat, ILG Virtual Conference, March 25, 2021

Cyber Security & Construction, National Association of Women in Construction, November 2020

Speaking Up on Silent Cyber, A.M. Best Webinar Panelist, May 2020

Emerging Global Cyber Ransom Threats Require A Strategic Response From The C-Suite, A.M. Best Insurance Law Podcast, July 2018

Cyber Claims: What to Do?, National Conference of Insurance Guaranty Funds, November 2017

Data Breaches Come in All Sizes, Beacon Technologies, April 26, 2017

Cyber: Global Perspectives, Insurance Law Global, International Insurance Defence Network Conference, March 2017

Cyber Security for the C Suite, panelist, SIM, February 7, 2017

Ethical and Statutory Concerns for Law Firms, webinar panelist, Bloomberg & CNA Insurance, November 2, 2016

Cybersecurity for the C Suite, panelist, Tatum, October 26, 2016

Cybersecurity: Emerging Trends and the Current Regulatory Environment for Independent Financial Advisors and Independent Financial Services Firm, Financial Services Institute (FSI) webinar, September 22, 2016

The Changing Landscape of Cyber Liability Litigation, ACI’s 13th Advanced Forum on Cyber & Data Risk Insurance, July 29, 2016

Attorney Client Privilege Issues Arising out of Data Breaches, Breach Responses, and Subsequent Third Party Litigation, ACI Data Breach & Privacy Litigation and Enforcement Conference, March 18, 2016

Developments and Emerging Trends in the Legal and Insurance Areas of Cybersecurity, Travelers Insurance, February 2016

A Legislative Update From the Front Lines, DRI Data Breach and Privacy Law Conference, November 4, 2015

Litigation Roundup Including Recent Supreme Court Developments on Article III Standing, Injury, Damages (Spokeo v. Robins), Class Actions, and Data Breach Litigation, ACI's 17th Advanced Global Legal & Compliance Forum on Cyber Security & Data Privacy and Protection, October 5, 2015

Cyber Liability Insurance: New Risks & Emerging Trends, Insurance Brokers' Association of the State of New York (IBANY), September 16, 2015

Liability Concerns for Architects, Engineers and Construction Professionals: Pennsylvania Intellectual Property Overview, Marshall Dennehey Client Seminar, July 2015

Online Ethics: Blawgs, Directory Listings, Q & A Forums & Social Media Use and Confidentiality and Data Security, National Business Institute, April 2015

Cyber Hackers Are Everywhere! Are You Prepared? Philly I-Day, April 9, 2015

Current Trends in Data Breach First and Third-Party Claims and Litigation, American Conference Institute's Cyber & Data Risk Insurance conference, March 24, 2015

Hot Topics in Employment, Assurex Loss Control & Claims Conference, October 22, 2014

Cyber Technology, Data Breaches and Related E&O Trends, Claims and Coverage, moderator and speaker, 8th Annual ExecuSummit E&O Insurance Conference, June 2014

Cyber Liability Exposures, Every Business Has Them, Panelist, PLUS Mid-Atlantic Chapter Seminar, May 2014

Hot Topics in Employment, Marshall Dennehey / AIG Seminar, Philadelphia, PA, October 10, 2013

Employment Liability in the Cyber Age, Marshall Dennehey / AIG Employment Seminar, Pittsburgh, PA, May 2, 2013

Cyber Liability Claims, Coverage Issues, panel speaker, 2nd Annual National Cyber Liabilities Insurance ExecuSummit, 2013

Data Privacy Risk: Red Flags in Higher Education, ASFAA Annual Conference, 2012

Media Commentary

' The Cost of Cybersecurity: Risks and Responses on the Rise,' The Legal Intelligencer, February 17, 2015

 

David J. Shannon (Philadelphia, Pennsylvania) View website

Awards

Distinguished Peer Rated
This award is granted to attorneys who have been recognized by their peers for very high ethical standards, with an average peer review score of 3.0 to 4.4.
Martindale-Hubbell Peer BV

Client Champion Awards

Client Champion awards recognize those attorneys who excel at service as affirmed by their clients. The awards, based on the quantity and quality of an attorney’s Martindale-Hubbell client reviews, demonstrate an ongoing commitment to delivering excellent client service. Award recipients stand out from their peers with a platinum, gold or silver icon.

Champion Badge Silver

At least three reviews and a score of 4.0 or higher.

Champion Badge Gold

At least six reviews and a score of 4.2 or higher.

Champion Badge Platinum

At least ten reviews and a score of 4.5 or higher.

Martindale Peer Awards

A lawyer who receives a minimum threshold of qualifying responses from fellow attorneys can qualify for one of three prestigious Martindale-Hubbell Peer Review Ratings:

Martindale-Hubbell Peer AV Preeminent Rating

AV Preeminent®: The highest peer rating standard. This rating signifies a large number of the lawyer’s peers rank him or her at the highest level of professional excellence for their legal knowledge, communication skills and ethical standards.

Martindale-Hubbell Peer Distinguished Rating

Distinguished: An excellent rating for a lawyer with some experience. This rating indicates the attorney is widely respected by their peers for high professional achievement and ethical standards.

David J. Shannon got this award in 2021

Martindale-Hubbell Peer Notable Rating

Notable: This rating indicates that the lawyer has been recognized by a large number of their peers for strong ethical standards.

Avvo Awards

Avvo Top Contributor

Avvo Top Contributor: The Avvo Top Contributor Award is granted to attorneys who have earned significant contribution points in a given year on our sister site, Avvo.com. Contribution points are earned by answering questions in Q&A, publishing Legal Guides, and other useful contributions to the Avvo community.

Avvo Client Choice

Avvo Client’s Choice: The Avvo Client's Choice Award Badge is granted to attorneys with a significant number of 4+ star reviews in a given year.

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Services

Areas of Law

  • Commercial Litigation
  • Other 5
    • COVID-19 Task Force 2020
    • Privacy and Data Security
    • Intellectual Property, Technology and Media Litigation
    • Architectural, Engineering and Construction Defect Litigation
    • Miscellaneous Professional Liability

Practice Details

  • Firm Information
    Position
    Shareholder; Chair, Privacy And Data Security; Chair, Intellectual Property, Technology And Media Litigation
    Firm Name
    Marshall Dennehey
  • Representative Cases & Transactions
    Cases
    Significant Representative Matters: Prevailed on a Motion to Dismiss in a data breach class action in the Eastern District of Pennsylvania. Sixteen named plaintiffs brought claims alleging that a hacker had accessed the personal information of over 1,000,000 individuals nationwide. We defended the debt collection company whose computer servers were compromised. Plaintiffs asserted broad
    novel legal theories, including negligent failure to protect data, breach of implied contract, invasion of privacy, negligence per se,
    violations of various state consumer protection laws. We successfully contested these claims, resulting in the dismissal of eight plaintiffs for lack of st
    ing
    15 of the 17 asserted causes of action being dismissed.
    Successfully represented
    assisted a large commercial payment card processing company in a data breach notice that affected over 2 million customers.
    Successfully defended
    resolved a multimillion dollar trademark
    dilution lawsuit in the 9th Circuit that included obtaining dismissal of the dilution claim.
    Obtained complete denial of a temporary
    permanent injunction motion after a weeklong injunction hearing in a trademark dispute over a well known East Coast antique show br
    .
    Successfully resolved several copyright infringement claims by an international music recording association against various entertainment venues.
    Obtained dismissal of all claims against a website developer on the first day of trial in a matter where plaintiff alleged significant lost profits after a new customer ordering platform was installed for plaintiff's website.
    Successfully resolved a significant copyright infringement claim by the heirs of a famous European author against a theater where plaintiff attempted to enjoin national theater production
    claim past
    future profits.
    Defeated vicarious liability claims for trademark infringement by luxury h
    bag manufacturer against the owner of a large retail shopping center. All claims were dismissed after a summary judgment motion was filed.
    Obtained voluntary dismissal of trade secret
    theft of confidential information matter where the initial dem
    was over $300,000 by demonstrating that no trade secrets existed in the plaintiff's manufacturing process.
    Successfully obtained summary judgment in an architectural copyright infringement action by demonstrating that client did not infringe on the plaintiff's drawings for a country club.
    Successfully defended international chemical company in temporary
    permanent injunction hearings regarding stolen trade secrets
    hiring of former plant manager.

    Representative Cases: Longenecker-Wells v. Benecard Services, No. 15-3538, 2016 U.S. App. LEXIS 15696 (3d Cir. Aug, 25, 2016).
    Gianacopoulos v. Glen Oak Country Club, 2007 U.S. Dist. LEXIS 7710 (M.D. Pa. 2007)
    Luszczynski v. Bradley, 729 A.2d 83 (Superior 1999)

    Published Works: 'Opportunity Knocks: Modern Trends With Business Email Compromise in a Changing Cyber World,' New Jersey Law Journal, November 27, 2024
    'Cybersecurity Threats: A Year in Review
    a Look Ahead,' The Legal Intelligencer, December 19, 2023.
    'Kaseya Data Breach Is Another Signal to Cyber Underwriters About the Dangers of Ransomware Attacks,' Defense Digest, Vol. 27, No. 4, September 2021
    'Cyber Threats: Why the Construction Industry Could be the Next Big Target,' The Legal Intelligencer, Construction Law Supplement, August 12, 2021
    'Kaseya Data Breach is Another Signal to Cyber Underwriters about the Dangers of Ransomware Attacks, ' PLUS Blog, July 19, 2021
    'Insurance Law Global: Emerging Global Cyber Ransom Threats Require a Strategic Response From the C-Suite - Episode #143,' Defense Digest, December 2018, Vol. 24, No. 4
    'Weightmans LLP & Insurance Day Cyber Risk Survey Report,' remarks on page 12. November 2015
    'The Impact of EU Rulings on the Cyber L
    scape,' Global Reinsurance, October 14, 2015
    'Are Hackers Secretly Stealing Your Practice?' The Legal Intelligencer, Cybersecurity Supplement (page 8), June 23, 2015
    'New Year's Resolutions? For Financial Firms
    Advisors, Cybersecurity Should Top the List,' Aon Advisor Solutions newsletter, Winter 2015
    'Financial Advisor Forecast: Stormy, With Scattered Data Breaches,' Financial Advisor, June 23, 2014
    'How to Minimize the Threat of the Dreaded Data Breach,' Catalyst, Winter 2013/2014, publication of the Pennsylvania Chamber of Business
    Industry
    'How to Avoid Liability for Comments Posted on Your Company's Website,' Mondaq.com, 2012
    AgentsofAmerica.com, 2012
    'In A Copyright Infringement Action, a Secondarily Liable Defendant Is Only Responsible For One Statutory Damage Award,' Pennsylvania Bar Association Intellectual Property Newsletter, 2011
    ' Starbucks v. Charbucks: Substantial Similarity Is Not Required To Prove Dilution By Blurring,' Intellectual Property Law Newsletter, Pennsylvania Bar Association, Summer, 2010
  • Additional Links
    https://marshalldennehey.com/attorneys/david-j-shannon

Experience

  • Bar Admission & Memberships
    Admissions
    1994, Pennsylvania
    1994, New Jersey
    1998, U.S. Court of Appeals 3rd Circuit
    1998, U.S District Court Eastern District of Pennsylvania
    2000, U.S District Court of New Jersey
    2006, U.S. District Court Middle District of Pennsylvania
    Memberships

    Associations & memberships

    Pennsylvania Bar Association, IP Law Section, Past Chair

    Philadelphia Bar Association

    Professional Liability Underwriting Society

  • Education & Certifications
    Law School
    Widener University School of Law
    Class of 1994
    J.D.
    Other Education
    Denison University
    Class of 1990
    B.A.

Contact David J. Shannon

Shareholder; Chair, Privacy And Data Security; Chair, Intellectual Property, Technology And Media Litigation at Marshall Dennehey
4.4
1 review

2000 Market Street, Suite 2300Philadelphia, PA 19103U.S.A.

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Attorneys FAQs

  • Is this attorney admitted to the bar in more than one state?
    Yes, David J. Shannon is admitted to practice in New Jersey and Pennsylvania.
  • Is this attorney Martindale-Hubbell Peer Review rated?
    Yes, David J. Shannon has a 4.4 Peer Rating from Martindale-Hubbell.
  • What law school did this attorney attend?
    David J. Shannon attended Widener University School of Law.
  • What year was this attorney's law firm established?
    Marshall Dennehey was established in 1962.

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