People

Tristan Konstantin Allen Managing Associate

San Francisco

Tristan's practice focuses on the representation of public and privately-held companies in securities class actions, shareholder derivative suits, and other complex business litigation matters. He also maintains an active pro bono practice that includes criminal and civil rights matters.

Tristan graduated Order of the Coif from the University of California, Berkeley School of Law. During law school, he externed for the Honorable Joseph C. Spero in the Northern District of California. Before law school, Tristan worked in investment banking.

Andrew Allen Senior Associate

Houston

Andrew concentrates his practice on corporate governance, securities law compliance and various capital markets transactions, including initial public offerings, notes offerings, preferred and follow-on offerings, exchange offers, tender offers, redemptions and consent solicitations. He also has significant experience in transactions involving special purpose acquisition companies including initial public offerings and de-SPAC transactions.

Lauren Allen-Yang Managing Associate

New York

Lauren has experience representing individuals and large companies at all stages of complex civil litigation, from fact-finding to motion practice and everything in between. Lauren practices in federal and state courts nationwide.

Daniel Alleva Managing Associate

Washington, D.C.

Prior to joining Orrick, Daniel was an associate at Buckley LLP.

Robert Allsbrook Of Counsel

New York

Colby has deep experience in financial services, asset-backed security and mortgage-related litigation, and has been at the forefront of litigation arising out of the financial crisis.

Prior to joining Orrick, he was a Director and senior litigation counsel at Credit Suisse Securities (USA) LLC, where he chaired the firm's Mortgage Securities Litigation Task Force and helped direct the bank's litigation response to the mortgage crisis. He previously practiced law in the New York offices of King & Spalding and Cadwalader, Wickersham & Taft.

Simon Alsey Partner

London

Simon represents client in connection with acquisitions, disposals, joint venture arrangements and project agreements in energy and infrastructure investments and financings.

Sarah Amari Associate

Paris

From Orrick Paris Tech Studio, Sarah combines her strategic legal insight with a keen interest in technology, enabling startups and investors tackle complex legal challenges.

Sarah advises founders, tech companies, and venture capital investors throughout their growth lifecycle, covering areas such as corporate governance, employee incentive plans, and M&A transactions.

Shane D. Anderson Senior Associate

Los Angeles

Shane has experience working on patent disputes in Federal Court and before the Patent Trial and Appeal Board for globally-recognized companies in the domains of software, communications, consumer electronics, and other high-tech fields.  He understands what it takes to be successful in complex patent litigation and wields his unique experience and education to gain the best result possible for his clients.  Prior to joining Orrick's Intellectual Property Group Shane practiced in Silicon Valley as an associate at a global law firm and focused on patent litigation.

Prior to law school, Shane was an electrical engineer and worked both in Japan and Canada, developing test systems, embedded hardware, and supervisory control and data acquisition (SCADA) software.  Shane also worked as an educator in rural Japan, an experience that informs his ability to explain complex topics both clearly and persuasively.

Shane also has a passion for community service and pro bono representation.  Among his efforts, he assisted with the representation of plaintiffs in a Voting Rights Act, Section 2, litigation, and advised a small business owner and drafted agreements and contracts.

Margaret Anderson Senior Associate

New York

Margaret represents companies and individuals in high-stakes litigation in federal and state courts nationwide. She has extensive experience in all stages of litigation, from pre-suit demands through the conclusion of the appellate process.

Daniela Andreatta Special Counsel

Milan

Daniela practice covers cross-border corporate transactions and the so called “special situations”, which include investments in distressed assets (non-performing loans, debt and/or equity in listed/unlisted distressed companies), buy-outs from insolvency proceedings and bankruptcy-related litigation. In recent years, she has assisted banks, Italian and foreign investors and debtors in complex deals of corporate restructurings relating to the financial indebtedness and concordato proceedings.

Prior to joining Orrick, Daniela was a member of Studio Legale Tributario in Milan, a law firm Associated with Ernst & Young International.

Patricia E. Anglin Of Counsel

San Francisco

Patricia is a trusted resource for her clients and leads complex negotiations to provide innovative solutions with regard to benefits design, administration and compliance. Patricia provides substantive knowledge in the defense of benefits litigation matters, has substantial experience with the employee benefit aspects of sales and acquisitions of businesses and is well-versed in the Affordable Care Act and HIPAA.

Patricia regularly advises general counsel, executive management, CEOs, boards of directors, retirement and health plan committees and key leadership of Fortune 500 companies on complex questions and issues regarding the operation of their domestic and international employee benefit plans and compliance with federal and state law.

Before joining the firm, Patricia acted as Senior Manager of National Employee Benefits at Kaiser Foundation Health Plan, Inc. and formerly served as Senior Counsel-Benefits and Executive Compensation at AirTouch Communications, Inc. (now Vodafone).

Patricia also acted as Legislation Counsel on the Joint Committee on Taxation within the United States Congress working extensively on the Clinton health care proposal and other benefits legislation. Prior to the Joint Committee, Patricia was an associate at Pillsbury, Madison & Sutro (now Pillsbury Winthrop).

John Ansbro Partner

New York

John litigates a wide range of commercial disputes, including financial services litigations involving RMBS, disputes in the wind and solar power industries across a host of contractual issues, construction disputes, long-term take-or-pay and liquidated damages disputes, force majeure, bankruptcy litigation, insurance recovery, and commercial real estate foreclosure. He was also an arbitrator on an ICC International Court of Arbitration panel in a cross-border industrial contract dispute.

COVID-19’s unprecedented global market impact has clients across an array of industries seeking John’s counsel on force majeure and related breach of contract disputes. These include force majeure matters across jurisdictions and industries, including Energy & Infrastructure, Pharmaceuticals, Financial Services, Real Estate, Hospitality, and Retail.

John litigates significant, high stakes matters. For example, in 2017 on behalf of his client Hemlock Semiconductor Corp., in a case of first impression in Michigan, on appeal John won the dismissal of an attempt by a Japanese conglomerate to avoid $1.4 billion in purchase obligations on the theory that alleged acts by the Chinese Government constituted an “act of government” under the parties’ force majeure provision. The Michigan Bar Journal declared it one of the top 10 business cases of 2010-2019. In 2019, one of the very few RMBS actions to be tried, John was trial counsel for Credit Suisse Securities USA in a $700 million dispute in the Supreme Court of New York. At trial he handled the defense expert in the critical area of loan underwriting.

Prior to joining Orrick, John was a Litigation Associate at Donovan Leisure Newton & Irvine LLP.