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Charting Our Own Course

We’ve never been a firm that sticks to the marked path. Our foundation—grounded in our history, our values, and a commitment to practical guidance—shapes how we navigate complexity and approach every challenge differently.

For companies ready to challenge the status quo and navigate a smarter path forward.

Founded by attorneys who led practice groups at the nation’s largest law firms, ZwillGen was built on a commitment to providing thoughtful, actionable solutions with greater agility and efficiency.

By leaving behind the bureaucracy of Big Law, we created a model designed for innovation—one that helps clients responsibly harness cutting-edge technologies while mitigating risk.

Today, we are a midsize law firm at the forefront of emerging technology, artificial intelligence, and data-driven legal challenges.

How We Got Here

What began in 2010 as a big idea inside a small Washington, DC row home has grown into a thriving coast-to-coast law firm with nearly fifty attorneys across offices in Washington, DC, New York, Chicago, and San Francisco, plus on-the-ground support in London, UK.

Founded in 2010 by Marc Zwillinger and Christian Genetski, Zwillinger Genetski LLP was known for its pioneering, anti-Big Law spirit and practical guidance. In 2011, Zwillinger Genetski LLP was rebranded as ZwillGen PLLC, and by 2014, the firm outgrew its Dupont Circle digs and moved a few blocks away to its current home at 1900 M Street NW.

Today, ZwillGen remains defined by that same pioneering spirit and practical mindset—helping companies and organizations of all sizes navigate emerging technologies and data-driven legal challenges with confidence.

Our Track Record

Year after year, our performance earns top recognition from leading legal publications for our exceptional client service and unparalleled subject-matter expertise.

  • Recognized by corporate counsel as a Litigation Powerhouse in BTI’s Litigation Outlook 2026

  • ZwillGen Attorneys Named 2025 BTI Client Service All-Stars

  • Ranked in BTI’s Client Service A-Team 2025

  • Named a 2025 “Law Firm Innovation Icon” by BTI Consulting Group

  • Voted by peers as a Best Law Firm for Privacy & Data Security (2025-2026)

  • Listed in Vault's Top 150 Under 150 (2025-2026)

  • Ranked in Chambers USA 2025 – Privacy & Data Security: The Elite

  • Ranked in Chambers USA 2025 – Gaming & Licensing

  • Named a Top 6 Most Recommended Midsize Law Firm by BTI (2025)

  • Ranked by Best Lawyers in the 2025 edition of the Best Law Firms publication

  • Distinguished in Litigation by BTI

  • Ranked in Chambers FinTech 2024

  • Recognized as some of the Best Attorneys for Startups by The Information

  • Shortlisted by Chambers for Privacy & Data Security Law Firm of the Year

  • Listed in the GDR 100 2023

  • Ranked 7th in Law360's 2021 Glass Ceiling Report for our female Shareholder representation

  • Law360 Privacy Group of the Year (2018)

  • Law360 Consumer Protection Group of the Year (2018)

Our Practices

Our work spans the most critical issues facing today’s technology and data-driven businesses—from AI, privacy, and global data protection to cybersecurity, law enforcement and surveillance, marketing and e-commerce, vendor contracting, alternative data, gaming and gambling, and complex investigations and litigation. With deep expertise and a highly specialized focus, our team is uniquely positioned to spot risks others might miss and provide clear, practical guidance that helps move your business forward.

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Privacy & Global Data Protection

Our team can help you asses, build, improve, and maintain your company's practices related to privacy, information security, marketing, vendor and customer contracting, and more.

Information Security

We develop consumer-facing and internal privacy and security policies and incident response plans that can bring your company into compliance with applicable laws and keep pace with developing industry standards.

Our Practices

Our work spans the most critical issues facing today’s technology and data-driven businesses—from AI, privacy, and global data protection to cybersecurity, law enforcement and surveillance, marketing and e-commerce, vendor contracting, alternative data, gaming and gambling, and complex investigations and litigation. With deep expertise and a highly specialized focus, our team is uniquely positioned to spot risks others might miss and provide clear, practical guidance that helps move your business forward.

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Artificial Intelligence

We advise clients on the development, operationalization, and adoption of machine learning, large language models, and other technologies powered by artificial intelligence.

Law Enforcement & Surveillance

We advise companies on their rights and responsibilities in responding to law enforcement requests, including issues related to subpoenas, court orders, search warrants, national security, and real-time surveillance orders.

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Shaped by Connection

Culture shaped by connection, collaboration, and the belief that great work starts with great people.

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