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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 a Leader in Client Service (BTI Client Service A-Team, 2026)

  • Ranked in Chambers USA 2026 — Privacy & Data Security: The Elite

  • Ranked in Chambers USA 2026 — Gaming & Licensing

  • Top 150 Under 150 (Vault, 2026)

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

  • Ranked Tier 1 in Washington, DC City Elite Rankings for Cybersecurity & Data Protection (Legal 500, 2026)

  • Ranked in the 2026 Edition of Best Law Firms (BestLawyers)

  • Recognized by corporate counsel as a Litigation Powerhouse (BTI Litigation Outlook, 2026)

  • Named a Law Firm Innovation Icon (BTI, 2025)

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

  • Recognized as some of the Best Attorneys for Startups (The Information, 2024)

  • Shortlisted for Privacy & Data Security Law Firm of the Year (Chambers, 2023)

  • Privacy Group of the Year (Law360, 2018)

  • Consumer Protection Group of the Year (Law360, 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 assess, 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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