About Us

ZwillGen is a mid-size boutique law firm that specializes in helping clients navigate legal challenges related to data and emerging technologies.

ZwillGen Washington Office

Leaving behind the bureaucracy of Big Law has allowed us to focus on one thing—delivering high value legal advice to help our clients make the most of new technologies.

We have built a strong practice counseling leading Internet, media, and tech companies and handling their high profile online legal issues.

Following years of running practice groups at the nation’s largest law firms, ZwillGen was founded on the principle of delivering thoughtful and practical solutions more efficiently.

Today, we offer unique services from a team of highly specialized attorneys, some of whom have spent the last 20 years developing their knowledge and experience with leading clients, firms, and issues. We make legal advice more accessible to our clients by offering alternatives to the traditional hourly law firm model, including innovative approaches that directly align firm incentives with client success.

Our History

What began in 2010 as a big idea in a small Washington, DC row house has become a thriving coast-to-coast law firm with nearly forty attorneys and spread across four offices in Washington, DC, New York, Chicago, and San Francisco.

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

In 2016, ZwillGen opened its California Subsidiary, ZG Subpoena Solutions, to help clients process third-party data requests. That same year, Managing Member and Founder Marc Zwillinger became known as “Apple’s Secret Weapon” for his representation of the company in Apple v. San Bernardino.

Today, ZwillGen continues to be known for its pioneering spirit and practical advice as it helps clients both big and small in a wide range of industries tackle emerging technology and data-related legal issues.


Since our founding, we have been consistently recognized and ranked by some of the legal industry's leading publications for our client service and commitment to diversity.

  • Ranked in Chambers USA 2024

  • Ranked in BTI’s Client Service A-Team 2024

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

  • Ranked by Best Lawyers in the 2024 edition of the Best Law Firms publication

  • Listed in Vault's Top 150 Under 150 (2024)

  • Voted by peers as a Best Law Firm for Privacy & Data Security (2024)

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

  • Listed in the GDR 100 2023

  • Ranked in Chambers FinTech 2023

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

  • Listed by BTI as a Most Recommended Law Firm (2021)

  • Law360 Privacy Group of the Year (2018)

  • Law360 Consumer Protection Group of the Year (2018)

Diversity, Equitability & Inclusion

We strive for a diverse, equitable, and inclusive environment, both for the benefit of our employees, but also because we know it helps us better serve our clients and their goals.

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