People

Mike O'Donnell Partner

Silicon Valley

Michael applies his broad experience in venture capital financings, public offerings, mergers and acquisitions, strategic alliances, technology licensing, and corporate spin-out transactions to each engagement. He has undertaken over 300 venture capital financings raising an estimated $7 billion for his clients, recently assisting Auris Health to raise over $650 million in financings before its sale to J&J for up to $5.75 billion.

He also brings extensive experience negotiating strategic alliances, representing clients in significant collaborations with GSK, Amgen, Schering-Plough, J&J, Daiichi, Astellas, King Pharmaceuticals, and most recently Pfizer, Merck, Baxter and Dainippon Sumitomo Pharma Co., Ltd.

Michael was the lead lawyer on the initial public offerings for Illumina, Neurocrine Biosciences, Cytokinetics, Pain Therapeutics, NeurogesX, Sequana Therapeutics, Ciphergen Biosystems, Argonaut Technologies, and Microcide Pharmaceuticals.

Michael was also the lead lawyer responsible for negotiating many notable biopharmaceutical spin-outs, including Onyx Pharmaceuticals (Chiron-Cetus), Tularik (Genentech), X-Ceptor (Ligand Pharmaceuticals), Metabasis (Gensia Sicor), and as well on the reverse merger of Transcept Pharmaceuticals with Novacea, creating a new publicly traded entity.

David O'Donovan Managing Associate

Londra

David's experience primarily includes renewable energy projects (onshore and offshore wind, solar PV, energy-from-waste and green hydrogen) and other energy transition projects (including carbon capture, utilisation and storage) with a particular focus on M&A, joint ventures and project development. He also has experience advising on governance, regulatory and ESG-related matters.

Anna O'Kelly Managing Associate

Londra

Anna has experience working with global companies on a wide variety of privacy, cybersecurity and data protection matters. She has a particular interest in emerging technologies and their intersection with ethical and social issues associated with her practice.

Anna has contributed a number of articles and thought leadership pieces on current data protection, privacy and information law issues.

Jake O'Neal Managing Associate

Los Angeles

Jake graduated first in his class with a degree in electrical engineering from the University of Colorado and worked at the Laboratory for Atmospheric and Space Physics, where he designed, built, and tested circuits for NASA-contracted space missions.  Since graduating in the top 10% of his class from the University of Southern California Gould School of Law, Jake has litigated diverse patent matters, encompassing cybersecurity, gaming, digital advertising technologies, analog and digital electronics, circuit design, testing, and fabrication, and renewable energy.  He also possesses notable experience in copyright cases involving AI and data scraping.  

Jake is deeply committed to pro bono work in indigent criminal defense, stemming from his Orrick fellowship at the Office of the Federal Public Defender for the Central District of California.  Notably, he successfully secured compassionate release for a client serving a life sentence and played a crucial role as third-chair in a 10-day trial involving a client charged with violating the Computer Fraud and Abuse Act (CFAA).

When Jake isn't advocating for his clients, he enjoys writing and recording music under the artist name Drip Lines and spending time with his wife, daughter, and two dogs.

Alyssa Ohanian Of Counsel

Santa Monica

Alyssa advises public company clients across a broad range of industries regarding equity offerings, compliance with federal securities laws, and requirements of the major U.S. stock exchanges. She assists in-house counsel, management, and boards of directors on SEC and stock exchange disclosure and reporting requirements, director and executive compensation, and corporate governance matters.

Alyssa also counsels both public and private companies on the design, implementation and taxation of executive compensation and equity compensation arrangements, including executive employment agreements, change in control and severance plans, and cash and equity incentive programs, along with other compensation and benefits matters in the context of ongoing business operations, M&A transactions, spin-offs, and venture capital financings.

Yumiko Ohta Partner

Tokyo

Yumiko also has knowledge related to international trade such as customs rules and export controls.

Before joining Orrick, Yumiko was an associate at Tanabe & Partners and advised clients in corporate transactions and employment law as well as represented clients in civil and family cases. She has experience serving as a statutory auditor for Japanese corporations. Prior to practicing law, she worked at Mitsubishi Corporation for seven years. While there, she was involved in LNG projects and other global business.

Enny Olaleye Associate

Washington, D.C.

Enny provides guidance on matters relating to numerous privacy and cybersecurity laws, including the U.S. state privacy laws in California, Colorado, Connecticut, Utah, Virginia and other states. Her work also includes counseling on compliance with Europe's General Data Protection Regulation (GDPR).

Enny graduated with honors from The University of Washington School of Law. While in law school, Enny served as the Editor-in-Chief of The Washington Journal of Law, Technology and Arts, Co-President of the UW Law and Business Association, Vice President of the UW Black Law Students Association and participated in the UW Law Mediation Clinic.

Carl Oldenbourg Associate

Monaco

He advises start-ups and scale-ups on their foundation, financing rounds and growth phases as well as on internationalization projects. He also advises VCs and corporate VCs on their investments.

Before starting his legal practice, he also worked as a trainee lawyer for a U.S. law firm in its San Francisco office.

Laurent Olléon Partner

Parigi

Laurent intervenes alongside his clients with legal and financial issues, both in terms of advice and litigation situations perspective.

Laurent deals with numerous issues in various fields: the tax consolidation system and, more generally, intra-group relations, the handling of bilateral tax treaties, the taxation of financial transactions, property taxation and local taxation, etc.

His recognized experience in the avoidance of abuse of rights enables corporate tax directors, financial investors and individuals to better secure their investment choices and structuring their transactions. In addition, his intimate knowledge of tax litigation is a major asset for clients.

Laurent has advised many ministries and public institutions on legislative and regulatory developments and their implementation, which gives him an extensive practical vision of both public and private law. His past experience has allowed him to manage and draft legislative bills, which makes him an authority on administrative and parliamentary machinery.

Before joining Orrick, Laurent was a judge of the Conseil d’État and assessor at the Court’s ninth Chamber of the litigation section of the Conseil d’État, worked as deputy Chief of staff of Marylise Lebranchu, the French Minister for the Civil Service, State Reform and Decentralisation and Chief of staff of Anne-Marie Escoffier, Deputy Minister of Decentralisation.

Bola Oloko Partner

New York

Bola has extensive experience representing leading financial services firms and other institutions, acting as counsel to issuers, underwriters, and other capital markets participants in a wide range of transactions.

Bola’s experience also includes advising clients in a variety of real estate capital markets transactions, secondary loan trading transactions (LSTA and non-LSTA), ISDA derivatives transactions, and securitization litigation and disputes.

Reese Oñate Managing Associate

San Francisco

Reese's practice spans both criminal and civil litigation in the white collar, securities, and complex business litigation fields. He represents and advises a diverse range of clients, including individual executives navigating criminal liability and employment disputes, as well as publicly traded corporations responding to an array of civil claims.

As a law student, Reese worked as an intern at the San Francisco City Attorney's Office in the Litigation Division as well as working as an extern with Legal Services of Northern California. 

Jake Ornstein Partner

New York

Jake provides strategic advice and counsel to startup founders and high-growth technology companies, as well as venture capital and other private equity funds.

He has broad experience in corporate and transactional matters, including venture capital financings, mergers and acquisitions and corporate formation and governance matters. He works closely with founders and technology company clients from a wide variety of industries to provide outside general counsel services and strategic business insights.

Jake also works extensively with venture capital and other private equity funds in their investment activities in the US and internationally, including early-stage to growth equity financings, mergers and acquisitions and secondary liquidity transactions.