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  • Tax
  • Corporate Tax
  • International Tax

Jonathan Rosen Partner Tax, Corporate Tax


Jonathan advises clients on all aspects of corporate tax, with a focus on domestic and international corporate and finance transactions, mergers and acquisitions, restructurings and reorganisations.

He has extensive experience of UK, cross-border and international tax matters across a variety of business sectors. Jonathan also advises on tax disputes, funds and investment structures.

Jonathan is qualified as a Chartered Tax Adviser (CTA) and is a member of the Chartered Institute of Taxation.



  • Employment Law & Litigation
  • Discrimination, Harassment & Retaliation
  • Pay Equity
  • Whistleblower & Corporate Investigations
  • Traditional Labor Law
  • Wage and Hour

Jill Rosenberg Partner Employment Law & Litigation, Discrimination, Harassment & Retaliation

New York

Jill Rosenberg, a New York employment law partner, is a nationally recognized employment litigator and counselor. Jill has significant experience defending and advising employers in discrimination, sexual harassment, whistleblowing, wrongful discharge, affirmative action, wage-and-hour and traditional labor matters. In recognition of Jill's practice, Chambers USA and Chambers Global awarded her a Band 1 ranking, with clients calling Jill "a terrific lawyer," noting her "stellar reputation for her representation of clients in employment litigation and internal investigations," and her "smart, responsive and practical approach to advice and litigation."

She handles complex individual cases, as well as class actions and systemic government investigations. She represents a broad range of companies, including employers in the securities industry, banks and financial institutions, accounting firms, law firms, and employers in the technology and media industries. Jill also has particular expertise in the representation of nonprofit entities, including colleges, universities, hospitals, foundations and cultural institutions.

She designs and conducts training programs for clients and frequently speaks on employment law issues for employer and bar association groups such as National Employment Law Institute, Practising Law Institute, National Association of College and University Attorneys and the New York State Bar Association.



  • Technology Companies Group

Chris Rosene Associate Technology Companies Group

Santa Monica

Chris Rosene, an associate in Orrick's Santa Monica office, is a member of the Technology Companies Group.

Chris represents high growth technology companies and venture capital firms in many areas, including corporate and securities law, corporate formations, and venture capital financings.

Chris earned his J.D. in 2018 from the UCLA School of Law, where he was elected to the Order of the Coif.  While in law school, Chris served as Dialectic Editor of the UCLA Law Review and was a judicial extern for the Honorable Holly Kendig at the Los Angeles Superior Court.  Chris graduated from Ball State University in 2013 with a Bachelor of Science degree in Mathematical Economics.



  • Antitrust & Competition
  • Complex Litigation & Dispute Resolution

Robert Rosenfeld Senior Counsel Antitrust & Competition, Complex Litigation & Dispute Resolution

San Francisco

Robert Rosenfeld, a partner in Orrick’s San Francisco office, focuses on antitrust, complex commercial litigation and financial institutions.

For more than a decade, Bob has represented Microsoft Corporation in numerous antitrust proceedings in California and elsewhere in the United States and abroad. In addition, he provides advice regarding antitrust issues to companies in Silicon Valley. He also has advised major health insurance companies and has litigated a number of cases involving the application of antitrust principles in the health care marketplace.

Bob's practice also includes complex business litigation, principally on behalf of major financial institutions. He has represented and counseled special litigation committees in the conduct of internal investigations and the prosecution and defense of derivative litigation. In 2011, Competition Law 360 listed him as one of 15 U.S. lawyers identified in a survey of corporate counsel as providing exceptional client service in antitrust matters.  He also served as Chair of Orrick's Antitrust & Competition Group for over eight years. 

From 1986 until 1992, Bob traveled to the Soviet Union on a number of occasions to participate with Soviet lawyers and academics in projects involving commercial matters and human rights issues.

Before joining Orrick, Bob practiced at Heller Ehrman LLP.



  • Supreme Court & Appellate
  • Intellectual Property
  • Complex Litigation & Dispute Resolution
  • White Collar, Investigations, Securities Litigation & Compliance
  • Antitrust & Competition

E. Joshua Rosenkranz Partner Supreme Court & Appellate, Intellectual Property

New York

Josh Rosenkranz is co-head of the firm’s Supreme Court & Appellate Litigation practice.

A former law clerk to U.S. Supreme Court Justice William J. Brennan Jr. and then-Judge Antonin Scalia on the D.C. Circuit, Josh has personally argued more than 190 appeals in state and federal appellate courts across the nation, including 18 before the U.S. Supreme Court.

Josh is the only lawyer ever named American Lawyer's “Litigator of the Year” twice. In 2012, the magazine dubbed him “the Defibrillator” based on his streak of appellate wins for companies that “appeared to be at death’s door,” and in 2017 it declared, he “still deserves the moniker we once gave him.”

Chambers USA has reported, “He wins accolades for his ‘brilliant analysis and judgment.’ Clients appreciate how he ‘rethinks every case from the ground up,’ and add: ‘He can take the most complicated legal or technological issue and present it in a way that seems like common sense.’” Another edition of Chambers USA added: “‘His briefs are quite simply beautiful,’” and “clients describe his courtroom presence as ‘both commanding and accessible at the same time.’ He has the ‘perfect combination of persuasiveness, intelligence, wit, and deference.’”

Josh's practice covers a wide range of subjects, including securities, intellectual property, antitrust, federal preemption, insurance law, corporate governance, criminal law and constitutional litigation. Among his recent clients are Credit Suisse, DIRECTV, DISH Network, Facebook, Genentech, Gilead, JPMorgan Chase, Kleiner Perkins, LinkedIn, Microsoft, Morgan Stanley, Oracle, and Royal Bank of Scotland.

Clients turn to Josh to win the highest stakes appeals, including appeals in cases that threaten the very survival of a business. He represented Microsoft in an international cause célèbre in the U.S. Supreme Court challenging the U.S. Government’s claim that it can serve warrants for emails stored overseas. He represented DISH Network in one of the most high-profile patent appeals in the country, successfully overturning an injunction that threatened the company's life. He represented Facebook in the high-profile battle waged by the founder's Harvard classmates, the Winklevoss twins, who laid claim to the idea for Facebook, winning a ruling from the Ninth Circuit to end the lawsuit. 

In 2005, he successfully represented Merck KGaA in a Supreme Court case that the National Law Journal described as “the most significant patent infringement case to confront the biotech and pharmaceutical industries in a generation.” He represented 36 law schools in a high-profile Supreme Court case against the Department of Defense. He also won a landmark victory in a Supreme Court case that rescued the estimated $60 billion U.S. market of copyrighted goods manufactured abroad.

Josh was the founding president and CEO of the Brennan Center for Justice at New York University School of Law, one of the country’s foremost public interest firms. Over the course of eight years, he was the Brennan Center’s chief strategist on litigation and public policy advocacy. Under his direction, the center represented parties in connection with more than 50 cases (including three at the U.S. Supreme Court). Before creating the Brennan Center, Josh founded the Office of the Appellate Defender, a public defender office specializing in criminal appeals.

Josh has published numerous books, monographs, chapters and scholarly articles. He has also authored 18 op-eds or articles in major newspapers and magazines, including The New York Times, The Washington Post, The Los Angeles Time, The Chicago Tribune, The Washington Monthly, The Boston Review, The National Law Journal, and The American Prospect.



  • White Collar, Investigations, Securities Litigation & Compliance
  • Internal Investigations
  • Securities Litigation, Class Actions and Shareholder Derivative Lawsuits
  • Trials
  • White Collar

Amy Ross Chief Practice Officer Litigation and Litigation Counsel White Collar, Investigations, Securities Litigation & Compliance, Internal Investigations

San Francisco

Amy M. Ross is the former Partner-in-Charge of the San Francisco office and a member of the Securities Litigation, Investigations and Enforcement Group.

Her practice focuses on the representation of public companies, directors and officers in securities class actions, SEC and DOJ investigations and enforcement actions, shareholder derivative actions and actions brought under federal and state securities laws.

Ms. Ross has extensive experience in litigation involving compliance breaches of fiduciary duty and securities law violations and conducting various types of corporate investigations.
Ms. Ross has represented the following companies and/or individuals associated with the following companies: Brocade Communications Systems, Inc.; Intel Corporation; Siebel Systems, Inc.; FormFactor, Inc.; SiRF Technology Holdings, Inc.; Qwest Communications; EFI; Atmel Corporation; and Autodesk, Inc.

Aviva M. Roth Senior Career Associate Tax

Washington, D.C.

Aviva Roth is a career associate in the Washington, D.C., office and a member of the Tax Group. She focuses her practice on the taxation of municipal finance.

Aviva has experience in governmental and exempt facility bonds, including general governmental facilities, 501(c)(3) bonds, tobacco asset securitizations, capital funds financing, arbitrage and post-issuance compliance relating to private use issues.

Prior to joining Orrick, she was a docket attorney at the Internal Revenue Service Office of Chief Counsel where she drafted regulations, notices and private letter rulings.



  • Real Estate

Daniel Rothberg Managing Associate Real Estate

Los Angeles

Daniel Rothberg is an Associate in Orrick's Real Estate group and is based in the firm's Los Angeles office.

His representative experience includes a wide variety of transactions involving diverse asset classes throughout the United States, including purchase and sale transactions, mortgage and mezzanine financing, joint venture formation, development, leasing, and corporate governance matters.  

Erica Rothenberg


  • Patents
  • Trade Secrets Litigation
  • Intellectual Property
  • U.S. International Trade Commission
  • Inter Partes Review (IPR)

Erica Rothenberg Associate Patents, Trade Secrets Litigation

Silicon Valley

Erica Rothenberg is an associate in Orrick’s Silicon Valley office and a member of the Intellectual Property Group.

Erica’s practice focuses on patent infringement litigation in federal district court and Section 337 proceedings before the ITC. Although her emphasis is in computer software, Erica counsels clients on a wide range of technologies, including semiconductors, printers, graphics processors and medical devices.

Before joining Orrick, Erica served as a law clerk at The White House and an intellectual property legal intern at LinkedIn. She taught herself Python programming at a young age and worked in database development prior to law school.


  • Cyber, Privacy & Data Innovation
  • Corporate Governance
  • M&A and Private Equity

Ivan Rotunno Special Counsel Cyber, Privacy & Data Innovation, Corporate Governance


Member of the Corporate Group, with experience in civil and commercial contracts, general corporate transactions and corporate governance.

Ivan has developed, also during his periods of externship in Coca Cola HBC Italia, Ing Direct Italia N.V. and Banca Esperia S.p.A. – Mediobanca Group, experience in regulatory and compliance matters, including Privacy and Data Protection, compliance with Legislative Decree 231/2001, Whistleblowing.

He is advising many clients in relation to the compliance to the Regulation (EU) 2016/679 on data protection and has been appointed as external Data Protection Officer and his expertise is recognized by Italian and international clients.

He is a regular lecturer in Seminars concerning privacy and data protection, cybersecurity, whistleblowing, legislative decree 231/2001.



  • Structured Finance
  • Banking & Finance

Judith Rousvoal Of Counsel Structured Finance, Banking & Finance


Judith Rousvoal is a banking and finance lawyer in Orrick's Paris office.

Judith advises French and international banks, financial institutions on project finance, structured finance as well as on complex infrastructure projects. 

Prior to joining Orrick, Judith was an associate for two years in the Banking & Finance department of Freshfields Bruckhaus Deringer and for five years in the Securization department of Gide Loyrette Nouel.


  • Intellectual Property
  • Japan

Steven J. Routh Partner Intellectual Property, Japan

Washington, D.C.

Having tried more than 30 cases over the past three decades, Steve Routh has built a reputation as a master strategist and courtroom advocate. In recognition of his accomplishments, since 2007 he has been a Fellow of the American College of Trial Lawyers, widely considered the premier professional trial organization in America with membership limited to one percent or fewer of each state's practicing lawyers.

Steve knows how to minimize risk while delivering a client’s business objective, by either defeating an opponent’s case at trial or through strategic motions or by negotiating the best possible settlement. His ability to pinpoint the argument which will resonate with each judge and jury has enabled him to protect cutting-edge technology involving semiconductor devices and manufacturing processes, telecommunications, digital and 3D imaging, liquid crystal displays, and medical devices. He has also used those same skills in litigating numerous antitrust, unfair competition, and complex tort and contract cases.

For the last 15 years, Steve has focused on guiding Japanese and other Asia-based companies through patent litigation before the ITC and U.S. District Courts. He is one of only two lawyers ranked in the Chambers Global guide for having Foreign Expertise in Intellectual Property for Japan. He is singled out for his wealth of experience acting for Japan-based clients, and is described as a "great negotiator who is excellent at creating litigation strategy." Steve is also a Chambers USA Band 4 IP practitioner. Clients interviews by Chambers noted, “His command of the law is evident in his ability to understand it and also apply it across a wide variety of situations," while others praise his ability to make "very quick and sound tactical decisions."