ZwillGen Appoints Two New Shareholders and Adds Two New Attorneys

NEW YORK, SAN FRANCISCO, and WASHINGTON, DCZwillGen is pleased to announce that two veteran attorneys of its California and New York offices have been newly appointed Shareholders of the Firm. In addition, ZwillGen has added one new attorney in Washington, DC to support its growing International Law Enforcement practice and one new attorney in New York to bolster its privacy capabilities, including privacy due diligence for acquisitions, mergers, and investment transactions.

Anna Hsia has been voted in as a Partner of ZwillGen Law LLP in San Francisco and Mason Weisz has been voted in as a Shareholder in ZwillGen PLLC’s New York office.

“Anna and Mason have become invaluable parts of the Firm and we will be looking to them as leaders to further develop our capabilities on both coasts outside of the Washington, DC office,” said Marc Zwillinger, ZwillGen’s Founder and Managing Member.

Additionally, Liz DeYoung, a former federal prosecutor at the Department of Justice, Criminal Division, Office of International Affairs, has been brought on in Washington, DC to assist the Firm’s growing Law Enforcement practice, especially with regard to working with International Law Enforcement and Cloud Act requests. Also, former Cleary Gottlieb Steen & Hamilton LLP attorney Jane Rosen has joined the Firm’s New York office to assist on privacy-related matters, including evaluating privacy due diligence as it relates to a wide spectrum of transactions ranging from acquisitions to investments.

About the Attorneys

Anna Hsia – Anna counsels clients on product development and privacy issues, and litigates complex business disputes. Her broad clientele includes Bay Area companies in the gig economy, online gaming, cloud computing, advertising, and biotechnology space. Anna has also served as the head of the Firm’s West Coast operations.
View Anna’s Bio >

Mason Weisz – Mason focuses on a wide variety of privacy, security, and Internet issues, with emphasis on helping companies that are subject to both US and European law, including in relation to the California Consumer Privacy Act and EU General Data Protection Regulation. For the past several years, he has led ZwillGen’s international efforts. A former web designer, he has extensive experience with the technology that drives digital media and e-commerce.
View Mason’s Bio >

Liz DeYoung – Liz has more than a decade of combined experience in private and government practice. Liz advises clients regarding demands for user data under ECPA, the CLOUD Act and data localization issues, engagement with law enforcement authorities (both within and outside of the United States), and other matters concerning cross-border access to data. She also provides a range of corporate governance, transactional, and commercial contracting advice to clients.
View Liz’s Bio >

Jane Rosen – Jane’s practice focuses on privacy, data protection, and technology-related issues. As a Certified Information Privacy Professional (CIPP/US), she advises clients on their legal obligations under applicable privacy laws and regulations, as well as strategies for managing compliance and risks. She has a strong background in transactional contexts such as mergers and acquisitions, joint ventures, financings, restructurings, capital markets offerings and various commercial, licensing, and services arrangements.
View Jane’s Bio >

Webinar: Best Practices for Private Fund Managers’ Use of Alternative Data

Join Stacey Brandenburg for a webinar covering issues relating to the use of alternative data by private fund managers, which are all the more important given the SEC’s reported focus on how investment advisers are accessing and using alternative data. The discussion will address:

  • generating or purchasing datasets, and the pros and cons of each;
  • managing third-party data providers;
  • complying with recent data privacy laws and cybersecurity guidance; and
  • avoiding insider trading and other risks.

The webinar will be moderated by William V. de Cordova, Editor-in-Chief of the Hedge Fund Law Report, and Stacey will be joined by Adam Reback, director at Optima Partners, and Jeffrey Neuburger, partner at Proskauer.

Date: January 15, 2020
Time: 11am – 12pm ET

ZwillGen Launches $100,000 Relief Initiative to Support Furloughed Federal Employees

WASHINGTON, D.C., January 22, 2019 – ZwillGen PLLC launched an initiative today to provide up to $100,000 in relief to federal workers who are affected by the government shutdown. Furloughed federal workers in the D.C., Maryland, and Virginia area can receive no-interest, no-fee loans for up to $500 without a credit check and with generous repayment terms.

To avoid any conflicts of interest, eligible federal workers must work for agencies where ZwillGen does not have any pending business and where the firm is unlikely to have any in the near future. These include agencies such as the EPA, National Park Service, and the TSA, and others to be determined on a case-by-case basis. Federal employees must also make less than $65,000 annually and work in the D.C. area to be eligible.

Interested federal employees should visit:

“We hope the President stops holding federal workers hostage as soon as possible, but in the meantime, we cannot ignore the needs of those in our community who are most affected,” said Marc Zwillinger, ZwillGen’s Founder and Managing Member. “We will do our part to help for as long as the shutdown is in effect.”

ZwillGen estimates that the initiative can help at least 200 people in the D.C. area. The firm invites its clients and other law firms to join this effort by providing additional funding. With more funds the program can support more furloughed workers.

“Our clients also care for those in need,” said Zwillinger. “We invite others who want to help to follow our lead. The opportunity here is simple: with more funds we all can help reduce the impact of this shutdown for more people.”

ZwillGen clients and partners who want to speak with us about this initiative can contact Alli Goings at

Protecting Personal Data: Insights from Brussels, Silicon Valley, and Beyond

Join the chief GDPR regulator and our own Mason Weisz in San Francisco on Wednesday, November 7 for a free “fireside chat” sponsored by the European Union. With a few other distinguished panelists, they will discuss EU, U.S., and California privacy developments. Food and drink will be served.

Buying and Using Alternative Data Sources: Best Practices

Join Marc Zwillinger at the 2018 Privacy + Security Forum in Washington, DC where he will speak alongside a vendor and a regulator on a panel that aims to discuss the ins and outs of alternative data including how to determine whether or not a source is reputable and best privacy practices for vendors.

Legal Landmines: How Law and Policy are Rapidly Shaping Information Security

Allison Bender will be attending Black Hat USA 2018 where she will be participating in the briefing, “Legal Landmines: How Law and Policy are Rapidly Shaping Information Security,” which aims to discuss emerging legal trends in information security.

Allison counsels Fortune 50 companies and startups in a range of industries on cybersecurity and privacy matters in the U.S. and internationally. Drawing from her roots in government, national security, and R&D, she helps clients navigate legal issues associated with emerging technologies and aids clients in strategically managing legal, financial, and reputational cybersecurity risks.

ZwillGen Bolsters Law Enforcement Team, Welcomes Former Oath Attorney Chris Madsen

WASHINGTON, D.C., July 31, 2018 – ZwillGen welcomes longtime friend of the firm and former Oath/Yahoo attorney, Chris Madsen, to ZwillGen as Counsel and Managing Director for ZG Subpoena Solutions (ZGSS).

Chris joins ZwillGen after more than a decade working on law enforcement and security matters in government and in-house at Oath/Yahoo, most recently as Vice President & Chief Counsel for Global Law Enforcement, Security and Safety. While at Oath/Yahoo, Chris led the legal teams responsible for formulation and implementation of law enforcement, data security, and content moderation policies and gained first-hand experience with a panoply of legal and policy issues that companies face with respect to law enforcement, data breaches, and user-generated content.

Chris said, “I am excited to work with ZwillGen and ZGSS to bring innovative solutions to clients that have to respond to government and third-party demands for data. Companies have to adapt to changes in demands for user data, in volume and in type, and keep up with frequently changing law and industry practice. ZG and ZGSS are leaders in this area, with deep experience and connections. I look forward to building on this foundation and adding my own in-house experience to help clients stay on top of these important issues.”

ZwillGen Founder, Marc Zwillinger, stated, “Chris brings valuable perspective and insight gained from years of in-house experience and at the Department of Justice. He has a deep understanding of how to navigate nuanced legal and policy issues, particularly with respect to law enforcement matters. We are very lucky to have him help lead ZGSS.”

Legal Frontiers in Digital Media

Media Law Resource Center is partnering with Berkeley Center for Law and Technology for their annual conference, Legal Frontiers in Digital Media. The conference explores emerging legal issues surrounding digital content in today’s multi-platform world. Stacey Brandenburg will be speaking at the session, “Scraping By with the Computer Fraud & Abuse Act.”

Fashion and Retail Law 2018: Trends and Development

Stacey Brandenburg will be attending Practicing Law Institute’s program, Fashion and Retail 2018: Trends and Developments. She will lead the session, “Cybersecurity Issues for Retail and Fashion Brands,” where she will discuss recommendations and strategies for combating cyber incidents before they occur.

Compliance 20/20: Insights Into Innovative Compliance Programs

Jason Wool will be speaking at Ascendant Compliance’s upcoming conference, Compliance 20/20: Insights Into Innovative Compliance Programs. He will be a panelist in the general session “Safeguarding Privacy and Monitoring the Business Risks of Electronic Data and Communication” where he will discuss regulatory obligations concerning data.