People

Tierra D. Piens Senior Associate

San Francisco; Houston

Tierra represents clients in high-stakes employment disputes, including individual and class action cases involving wage-and-hour laws, discrimination, harassment, and wrongful termination. She also provides strategic employment advice and counseling, helping clients navigate complex legal landscapes with confidence.

In addition to her litigation and advisory work, Tierra conducts internal investigations, providing clients with thorough and effective solutions to sensitive workplace issues.

As an experienced DEI advisor, Tierra assists clients in re-evaluating and strategically repackaging their diversity, equity, and inclusion programs in response to recent legal challenges and the new Trump administration. Her insights help clients adapt to the evolving legal environment while maintaining their commitment to inclusive workplaces.

Tierra's hands-on experience includes a nine-month secondment at Airbnb, where she was embedded with the global employment legal team. During this time, she addressed employment issues from both a U.S. and global perspective, gaining invaluable day-to-day experience.

While her practice focuses primarily on the representation of large corporate clients and emerging companies, Tierra also devotes a portion of her practice to providing pro bono services to nonprofit organizations and low-income individuals. She also serves in several leadership roles at Orrick, including as a leader of the Black Lawyers of Orrick inclusion network and on Orrick's Associates' Committee for the San Francisco office.

Tierra received her J.D. from the University of California, Berkeley, School of Law, where she also earned a Law & Technology Certificate of Specialization as recognition for her extensive coursework in technology law.

A former judicial extern on the Northern District of California, Tierra has experience navigating both the federal and state court systems.

Nicholas Poli Partner

New York

Nick is an experienced bankruptcy litigator, representing financial institutions, pharmaceutical companies, and trustees in all stages of the bankruptcy process. Most recently, Nick served as co-lead trial counsel to the private credit arm of a global financial company and secured a $100 million trial victory in connection with multiple defaulted loans.

Nicholas also has extensive experience in issues arising out of the financial crisis, including a range of issues relating to residential mortgage backed securities (“RMBS”) and lending practices. He has represented issuers and sponsors of RMBS in fraud and breach of contract cases, as well as federal and state securities actions. Nicholas has defended a global financial institution in connection with two separate trials in the New York Supreme Court.

Nicholas is a key member of the Orrick team that represents Goldman Sachs and Credit Suisse, multinational investment banks and financial services companies, in connection with more than a dozen cases. This includes defending the clients against claims brought by investors, trustees, and monoline insurance companies in connection with the purchase and sale of RMBS. Nicholas also completed a secondment at Credit Suisse, where he was in the litigation and investigations group. During this time, he worked on regulatory matters involving FINRA, the SEC, the DOJ, the CFTC, and the NY Department of Financial Services. Additionally, he handled internal investigations addressing issues such as insider trading.

Nicholas has also represented one of the nation’s largest mortgage loan servicers, including in a class action lawsuit involving allegations of improper loan servicing practices.

Darren Pouliot Senior Associate

London

Darren is a dual-qualified American lawyer and solicitor-advocate of England and Wales. He has an established record of working closely with clients across the finance, commodities, energy, life sciences and technology industries on all stages of disputes.

He represents clients in international arbitral proceedings under the major arbitral institutions' rules, as well as in American federal and state courts. He also holds Higher Rights of Audience with the Senior Courts of England & Wales. Darren maintains an active pro bono practice with a focus on criminal, habeas, and constitutional cases on appeal.

Darren also has direct in-house experience, having undertaken secondment to the fast-paced litigation department of one of the world's largest investment banks. He worked closely with the in-house team to assess litigation risk, advise stakeholders, and manage ongoing global litigations. He now frequently works with clients to develop their dispute resolution terms, processes, and trainings for other in-house functions.

Prior to joining Orrick, Darren earned his Juris Doctorate from Columbia Law School where he led the Columbia Business Law Review as its Editor-in-Chief and extensively studied federal constitutional, administrative, and criminal law. While there, he was a judicial intern in multiple levels of the U.S. federal judiciary, including the Second Circuit Court of Appeals, the Southern District of New York, and the District of New Jersey.

Sloan Renfro Spencer Managing Associate

Washington, D.C.

Her litigation practice focuses on complex securities matters, financial regulatory enforcement actions, and internal investigations. Recently, she has represented:

• Louis Dreyfus Company in an ongoing commodities class action litigation;
• A publicly traded pharmaceutical company in ongoing government investigations; and
• A Fortune 50 company in ongoing shareholder demand disputes.

Sloan was also recently published in The American Criminal Law Review for her note, “The Need for a Clear Statement After 'Bridgegate': Combatting SCOTUS’s Narrowing View of Corruption with an 'Abuse of Functions' Offense."

Robert Reznick Senior Counsel

Washington, D.C.

He currently is national coordinating counsel for a major oil company in connection with its climate change litigation. He previously served as co-lead counsel to a major international pharmaceutical manufacturer in the defense of nationwide litigation challenging industry pricing practices.

Rob’s experience includes extensive work in antitrust and False Claims Act cases, claims alleging fraud, and agency enforcement actions. His pharmaceutical industry activities include service as outside counsel to and Corporate Secretary of the Pharmaceutical Security Institute, Inc., the industry’s not-for-profit trade organization dedicated to the fight against pharmaceutical counterfeiting.

He is Managing Editor of The World in U.S. Courts, Orrick’s quarterly review of court decisions addressing personal jurisdiction over non-U.S. parties and the extraterritorial application of U.S. law to global business and cross-border activities.

Rob also served two terms on the District of Columbia Bar’s Pro Bono standing committee. Before joining Orrick, he was a partner in Hughes Hubbard & Reed LLP and Clifford & Warnke, in Washington, D.C.

Kevin Riehle Senior Associate

Düsseldorf

His focus is on contractual disputes in the energy, infrastructure, and technology sectors, where his clients benefit from his experience in high-volume arbitration proceedings. In addition, Kevin is well-versed in legal disputes in the supply industry, the iron and steel industry, and investment arbitration.

In the field of arbitration, he handles proceedings under all relevant arbitration rules, including DIS, ICC, LCIA, UNCITRAL, and AAA.

Before joining Orrick, Kevin deepened his specialized knowledge in litigation and conflict resolution through by working for three other leading international law firms in Germany and internationally.

Emma Roche Associate

Silicon Valley

Emma works on a wide range of civil dispute matters, from issues developing at the cutting edge of the intersections of technology and the law, to those that make up the core of commercial disputes.

Bailey Roe Managing Associate

Washington, D.C.

Bailey is a procedural strategist at heart, focused on solving complex problems for clients across a variety of U.S. and international forums. With a commitment to deeply understanding both procedural rules and substantive law, she navigates the intricacies of litigation, arbitration, and regulatory proceedings to deliver creative, practical solutions to her clients. Her work spans multiple jurisdictions, and she is adept at handling high-stakes disputes in both domestic and global contexts.

Whether advising clients in U.S. courts or before international tribunals, Bailey is dedicated to identifying the most efficient and effective path to resolution. She thrives on devising tailored strategies that align with her clients’ business objectives while minimizing risk and maximizing opportunities.

Bailey co-authored a chapter in The Award in International Investment Arbitration, published by Oxford Press in 2024. She also teaches a course on International Commercial Arbitration Advocacy at American University's Washington College of Law and coaches the AUWCL Willem C. Vis International Commercial Arbitration Moot Court Competition.

Alison Roffi General Counsel

New York

Alison advises the firm on matters related to corporate governance, client relationships, and professional responsibility and ethics related to the practice of law. She has developed deep experience in the ethical considerations surrounding the use of legal tech, including AI and GenAI tools.

Alison provides legal advice to Orrick’s Board and Management Committee regarding firm management, growth, and policies. She is a member of the firm’s Operations Team and sits on the Risk Management Committee and AI Council. She also serves on the Risk Management Committee of MPC, the firm’s malpractice insurer.

Prior to joining the firm’s Office of General Counsel, Alison was a litigator in the firm’s Complex Litigation and Dispute Resolution group. Her practice focused on representing audit firms and accountants in regulatory proceedings as well as civil disputes related to professional liability and representing insurance policyholders in matters related to coverage, claims, and recovery. She has experience managing and conducting large-scale internal investigations, liaising with regulators, and managing cross-border risk and liability. Alison also defended financial institutions in lawsuits arising out of the global financial crisis.

Camille Joanne Rosca Partner

New York

Camille has represented public companies and other large national and multinational enterprises in financial services-related litigation, including Goldman Sachs, Credit Suisse, and Nationstar Mortgage LLC d/b/a Mr. Cooper, in federal and state court proceedings across the country. She has extensive experience defending clients in litigation alleging fraud, breach of contract, tort claims, class action claims, and securities law violations, including:

• Defending sponsors and underwriters of residential mortgage-backed securities against breach of contract and securities fraud actions brought by institutional investors, securitization trustees, and regulators in federal and state courts across the United States.
• Defending one of the largest mortgage servicers in the country against complex breach of contract claims brought by an investment management firm.
• Defending and advising companies with class action lawsuits against consumer protection claims, including one of the world's largest investment management firms in connection with multiple consumer class action lawsuits across state and federal jurisdictions.
• Defending one of the largest private equity firms in the country against breach of contract and statutory claims.

Prior to joining Orrick, Camille served as a law clerk to Justice Anne M. Patterson of the New Jersey Supreme Court. With her New Jersey connections, Camille has remained active in the New Jersey bar, advising and acting as local counsel in a number of pending complex litigation matters in New Jersey state and federal courts.

Camille is active in pro bono matters, including representing veterans.  She has represented clients in partnership with the National Veterans Legal Services Program and Veterans Advocacy Project. 

Camille is also one of the co-chairs of the Financial Services Network for the National Asian Pacific American Bar Association and co-leads Orrick’s DiversAbility Network.

E. Joshua Rosenkranz Partner

New York

Josh has been named American Lawyer's “Litigator of the Year” twice, in addition to being a finalist for 2022. 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.”

In 2014, The Financial Times named Josh one of the 10 most innovative lawyers in the North American legal sector for his work “demystify[ing] the technical issues” and securing a victory in the blockbuster Federal Circuit appeal, Oracle v. Google. 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 intellectual property, financial services, securities, privacy, antitrust, federal preemption, insurance law, corporate governance, criminal law, and constitutional litigation. Among his recent clients are Cisco, Credit Suisse, Cox Communications, DISH Network, Genentech, Gilead, Johnson & Johnson, JPMorgan Chase, Microsoft, Mozilla, Oracle, Sonos, 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. For example:

• 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 has been lead counsel in multiple cases either defending or challenging verdicts over $1 billion.
• 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.
• He won a landmark victory in a Supreme Court case that rescued the estimated $60 billion U.S. market of copyrighted goods manufactured abroad.
• He represented 36 law schools in a high-profile Supreme Court case against the Department of Defense.

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. Before that, Josh founded the Office of the Appellate Defender, a public defender office specializing in criminal appeals.

Ari Roytenberg Senior Associate

New York

Ari's experience includes supervising cases through all phases of litigation, from pre-litigation strategy through appeal. Most recently, Ari served as lead counsel to an aerospace defense company in litigation that began in New York State court and continued through a six-month trial in bankruptcy court in connection with a $1.3 billion restructuring transaction. His courtroom advocacy, briefing strategies, and fact and expert depositions have helped secure favorable outcomes to a number of clients involved in high-stakes disputes.

Before joining Orrick, Ari was an associate with Quinn Emanuel Urquhart & Sullivan LLP and served as a law clerk to Judge Richard M. Berman on the United States District Court for the Southern District of New York.