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About ZwillGen PLLC

ZwillGen is a boutique law firm that has investigated, litigated and counseled some of the biggest names in technology on a wide-range of Internet issues including cybercrime, information security, privacy, and Internet gambling. Since its founding ZwillGen’s lawyers have been ranked and recognized in Chambers USA for their focus in Privacy and Data Security. In addition to the founding D.C. office, the firm has offices in New York, San Francisco, & Chicago.

A Forward Thinking Mindset

The firm’s goal of leaving behind big law bureaucracy has allowed them to focus on one thing—to help clients find the way to get the most out of new technologies. Because of this, ZwillGen has snagged many prominent tech clients, such as Airbnb, Atlassian, FanDuel, GoPro, Quora, Slack, WhatsApp


Attorneys at ZwillGen aren’t just tackling online issues, they’re also taking on work outside the office—and together, at that! The firm’s attorneys help out at everything from the National Arboretum to The Salvation Army. 

ZwillGen PLLC

1900 M Street NW
Suite 250
Washington, DC 20036
Phone: (202) 296-3585

Firm Stats

Founder and Managing Partner: Marc Zwillinger
Total No. Attorneys 2020:
1 - 50

Employment Contact

Major Office Locations

Washington, DC (HQ)
Chicago, IL
New York, NY
San Francisco, CA

Major Departments

End-User Policies, TOS, & Privacy Policies
Fraud, Phishing, Spam & Other Online Abuses
Ad Tech Law & Privacy Consulting
Data Protection & Information Security
Online Child Protection, Safety & Reporting Obligations
Cloud Computing
Internet Gaming, Gambling Law & Fantasy Sports
Breach Notification & Incident Response
Copyright Infringement & DMCA
Subpoena Compliance
Law Enforcement & Surveillance
FTC & State AG Investigations
Alternative Data Usage