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Thomas Zellerbach Partner Intellectual Property, Copyright, Trademark & False Advertising

Silicon Valley

Tom Zellerbach, a partner in Orrick's Silicon Valley office, is a trusted advisor and experienced litigator for companies facing important trademark, copyright, advertising, and trade secret issues.  

Tom has has extensive experience in cases before the federal courts, the U.S. Patent and Trademark Office/Trademark Trial and Appeals Board, and the National Advertising Division on behalf of both emerging and institutional clients in a wide variety of industries.  Tom's consistent goal is to get the best result in each particular situation for clients, whether it is obtaining a litigation victory or finding a positive way to resolve a dispute short of litigation.

Yuanjia (Gina) Zhang Patent Agent Patents

Silicon Valley

Dr. Yuanjia (Gina) Zhang, a patent agent in the Silicon Valley office, is a member of the Intellectual Property Group.  As a patent agent, Dr. Zhang performs tasks related to patent prosecution including preparing and prosecuting patent applications. 

Dr. Zhang has broad technical background and experience in materials science and engineering, electronic devices, nanotechnology, and printing technology.  In particular, her technical areas include nanofabrication, semiconductors, organic electronics, molecular electronics, optoelectronics, electrophotography, inkjet printing, surface engineering, color science, and image processing.

Prior to joining Orrick, Dr. Zhang worked at Anova Law Group, where she prepared and prosecuted patent applications for large Chinese companies and prestigious universities, in industrial areas including Internet technology and semiconductor devices.  Before joining Anova Law Group, Dr. Zhang was a member of research staff in Xerox Innovation Group at Xerox Corporation.  Dr. Zhang also has prior industrial experiences at IBM T.J. Watson Research Center and Advanced Semiconductor Manufacturing Corporation, in Shanghai, China.  Dr. Zhang’s doctoral research focused on the electronic charge injection and transport in nanoscale organic thin film transistors.

Dr. Zhang has technical publications in journals including Advanced Materials and Journal of Applied Physics.  Dr. Zhang is also an inventor with six U.S. patents granted and other U.S. and foreign patent applications pending.


Shelley Zhang Partner Intellectual Property, Patents


Shelley Zhang, a partner in Orrick’s Beijing office, is a member of the Intellectual Property Group. Her practice focuses on IP prosecution and enforcement. Shelley has extensive experience in patents, trademarks, domain names, copyrights and trade secrets.

Shelley's related IP experience includes the following:

  • Patent invalidation proceedings, anti-counterfeiting, anti-piracy efforts and patent and trademark enforcement litigation in China.
  • Prosecution of patent and trademark, including application preparation, office actions/oppositions procedures and reexamination procedures.
  • Enforcement and technology transfer/licensing arrangements for substantial patent and trademark portfolios for companies doing business in China.
  • Advising on IP protection strategies, R&D related IP issues and matters in relation to export and import control of technology.
  • Assisting Chinese companies in Section 337 U.S. International Trade Commission investigation, patent infringement litigations and product liability litigations in the U.S. 
  • IP due diligence and portfolio counseling.

Dr. Andre Zimmermann LL.M. Partner Employment Law & Litigation, Employment Advice & Counseling

Düsseldorf; Munich

André, a Certified Specialist for Employment Law (Fachanwalt für Arbeitsrecht), heads Orrick’s German Employment Practice. He advises German and international companies in all areas of individual and collective employment law. With around ten years of international experience, André is well-versed in employment aspects of M&A transactions, restructuring and employment related litigation.

The main focus of André's practice include employment aspects of M&A transactions, restructuring, outsourcing and headcount reduction, multi-jurisdictional and cross-border employment issues, service agreements of managing directors and board members, co-determination of employees at operation and board level, collective bargaining and negotiations with works councils and trade unions and litigation.

André is an acknowledged specialist in employing third-party personnel, especially through temporary agency work. Moreover, he is very experienced in aspects of employment compliance, internal investigations and employee data protection.


Catherine Zinn Chief Client Officer

San Francisco

As Orrick’s Chief Client Officer, Catherine helps to ensure that the firm is a steward of our clients’ businesses. Catherine supports Orrick’s commitment to each client’s cause by listening to their views and concerns, responding to their needs, and articulating a shared understanding of priorities.

Among other responsibilities, Catherine meets with clients to solicit their feedback and works with the firm’s client relationship partners and teams to help deliver value added services. She also coordinates the firm’s strategic partnerships with thought leadership and community organizations, also designed to add value for our clients and enhance the firm’s social impact.

Previously, Catherine held senior client relations roles at DLA Piper and at JAMS, the country’s largest private provider of mediation and arbitration services.

Catherine serves on the boards of various organizations including: Silicon Valley Directors’ Exchange, Law Foundation of Silicon Valley, Bay Area Cancer Connections, and Legal Services Sales Organization. In January of 2015, the Secretary of Health and Human Services appointed her to the Board of the National Foundation for Fitness, Sports and Nutrition for a six-year term.

In 2008, Catherine served on Hillary Clinton’s National Finance Committee, and, beginning in 2011, she served on Barack Obama’s National Finance Committee as the National Coordinating Co-Chair of Lawyers for Obama.

Currently, she is a Community Liaison for Kamala Harris for Senate. Catherine was recognized as a 2014 Woman of Influence by the Silicon Valley Business Journal and a 2015 Woman of Achievement by Legal Momentum. In January of 2015 she was inducted into the International Women’s Forum and invited to be an American Leadership Forum Fellow for 2015-2016.


Joel F. Zipp Senior Counsel Energy, Infrastructure

Washington, D.C.

Joel Zipp, a lawyer in Orrick’s Washington, D.C., office, is a member of the firm’s Energy & Infrastructure group with 40 years of experience in the energy industry. Joel advises a range of clients on energy market and regulation matters, including pipelines and shippers, on energy transactions, energy project development, the acquisition of energy assets and capacity.

He has extensive experience working with clients on conventional energy projects, such as oil and gas pipelines and LNG facilities. He has also advised on electric transmission matters and renewable energy issues. Prior to entering private practice, Joel served as an attorney in the Federal Energy Regulatory Commission's (FERC) Office of General Counsel, where he worked on large-scale energy projects such as LNG and coal gasification. He was also assistant director in its first Office of Enforcement, and a past president of the Energy Bar Association.

Joel advises and represents investors on federal and state energy regulatory and transactional matters surrounding the acquisition and construction of assets totaling billions of dollars in value. Joel has been general counsel, secretary, and project counsel for several joint venture interstate pipeline projects, including "greenfield" projects. He has been responsible for all legal aspects of joint venture and other pipeline projects from inception to commercial operation. In some cases, he served as part of the senior management team involved in all business issues and strategic decision-making.

In addition, Joel has advised on a range of rate and regulatory matters relating to electric energy markets administered by independent system operators (ISOs), including: representation before the FERC and as a voting representative for a client, at New York and New England ISOs management committee and subcommittee meetings; representation before NEPOOL and litigation before the NEPOOL Review Board; litigation on energy market prices in ISO administered markets; electric transmission access and pricing; and RTO formation.

His representation includes negotiating and drafting project agreements such as: construction, operation and maintenance and joint ownership agreements; the terms and conditions of FERC electric and gas tariffs; undivided ownership interests; precedent agreements and transportation contracts; and interconnection agreements. He also has been responsible for project financing, permitting, environmental review and right-of-way acquisition.

Joel also has broad experience working with local distribution companies, interstate and intrastate pipelines, midstream companies and end users on the full range of rate and certificate proceedings before the FERC, and has assisted European clients seeking to acquire ownership of and capacity in U.S.-based LNG terminal and related pipeline facilities. His experience in these matters includes: the heads-of agreement, LNG supply agreement, terminal use agreement, interconnection agreement and downstream transportation arrangements. He also negotiated a landmark ground lease for a LNG terminal host site and pipeline on publicly-owned land.


Déborah Zizzo Associate Complex Litigation & Dispute Resolution


Déborah Zizzo is a litigation lawyer in Orrick's Paris office.

Déborah advises French and international companies on litigation matters.

Prior to joining Orrick, Déborah was an intern in the litigation departments of Weil, Gotshal & Manges, Winston & Strawn, in Paris and at Ginestié Magellan Paley-Vincent in Hong Kong.


Shasha Y. Zou Managing Associate

New York

Shasha Y. Zou is a litigation managing associate in the New York office. Her practice focuses on complex commercial litigation, including in matters involving intellectual property, commercial contracts, and securities.

Shasha's engagements include representing a major biotechnology company in an ICC arbitration proceeding and related proceedings in federal district court in connection with allegations of patent infringement. She also has recently represented a major software company in a jury trial over copyright infringement of source code and defended a satellite service provider in a bench trial against billion-dollar claims brought by the Department of Justice and four state Attorneys Generals related to its telemarketing practices.

Shasha takes an active role in Orrick's pro bono program. She has worked on asylum applications and also obtained a successful settlement on behalf of a client in the Southern District of New York in a copyright matter after the court granted summary judgment on the issue of copyright ownership.


Mitchell Zuklie Orrick Chairman Technology Companies Group, M&A and Private Equity

Silicon Valley

Mitchell Zuklie serves as the global Chairman and Chief Executive Officer of Orrick.

He is an experienced business and legal advisor who has completed hundreds of venture capital financings and numerous public offerings, mergers, acquisitions and licensing transactions. He counsels technology companies at all stages of their life cycles, as well as their founders, advisors and investors. Representative clients have included Nest Labs, Planet Labs, Nanosolar, eHarmony, Royal Dutch Shell, Kleiner Perkins, Benchmark Capital, Pandora, Oracle, Goldman Sachs, Martha Stewart Living, Bessemer Venture Partners and Sequoia Capital. Recent transactions he has led include, among others, Nest Labs' announced $3.2 billion sale to Google, and Goodreads' sale to

Lawdragon recognizes Mitch as "one of the nation's top tech dealmakers and advisors." He is described by Chambers as a "terrific all-around lawyer" known for "common sense and business judgment." Daily Journal named him to its lists of Top Emerging Companies Lawyers and Top Clean Tech Lawyers.

During Mitch's tenure as Orrick's chairman and CEO, the firm has pursued a strategy of leadership in the global Technology, Energy & Infrastructure and Finance sectors. The firm entered new markets in Houston, Geneva and Africa. The firm has also innovated in advancing women and diverse lawyers and adapting its model to appeal to top Millennial talent.

Mitch serves on the Board of the Berkeley Center for Law, Business and the Economy and on the Advisory Board of the Stanford Law School Center on the Legal Profession. Mitch also created Orrick's Women's Advisory Board, which is comprised of the senior executives from several leading public and private companies. Before joining Orrick, he was a Director at Venture Law Group.

He and his wife, Holly, have been married for more than 20 years. They have two children, Hannah (17) and Angus (15).