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Dominic O'Brien Partner Banking & Finance, Direct Lending


Dominic is a partner in the firm's English law Banking and Finance Practice with a particular focus on leveraged acquisition and single-asset financings. Dominic has significant experience of advising senior lenders, alternative credit providers, sponsors and borrowers on domestic UK and cross-border international financings.

Dominic has advised on a wide range of corporate and single-asset financings, including traditional greenfield and brownfield energy and infrastructure project financings, real estate financings, reserved-based and commodities financings and telecom projects in Europe, the Middle East, Africa and Asia.

Dominic has also advised on a wide variety of Islamic finance contracts and is experienced in structuring sharia-compliant products for both Islamic and non-Islamic institutions.

Kathleen O'Connor Partner Complex Litigation & Dispute Resolution, Mass Torts & Product Liability

New York

Kathy O'Connor is a litigation partner in Orrick's Complex Litigation and Dispute Resolution Group and is a co-chair of the firm's life sciences practice. Kathy focuses on complex disputes involving life sciences and consumer products companies.  

Kathy's practice focuses on complex product liability and commercial claims, consumer fraud class actions, licensing and co-development disputes, and government investigations, primarily for branded pharmaceutical, biotechnology and medical device companies, as well as consumer products companies. She is regularly called upon to advise on litigation and compliance strategy, particularly in complex matters that involve concurrent civil and government actions. She also consults with clients in their effort to manage and mitigate risk. Kathy brings a unique perspective to Orrick's practice, having previously served as an in-house lawyer at Merck.

Prior to joining Orrick, Kathy was a litigation partner at Weil Gotshal. She is regularly recognized as a leading practitioner by lawyer ranking entities such as Euromoney Expert Guides' Women in Business Law and The Legal 500, which singled out her product liability and mass torts defense work.


Peter O'Driscoll Partner Emerging Markets, M&A and Private Equity

New York; London

Peter O'Driscoll heads Orrick's Emerging Markets Group. He has extensive experience in cross-border M&A, private equity, corporate conflicts, impact investment, and growth capital transactions in emerging markets, Europe and the United States.

In addition, he advises on corporate governance matters and has led internal investigations. Although he has worked in a number of industry sectors, much of Peter's work has been focused on transactions in the mobile telecommunications, oil and gas and mining sectors.

Peter practiced in New York from 1987 to 1991, in London from 1991 until 2010, and in New York from 2010 until April 2013. He now resides in Lugano, Switzerland, and divides his time between Orrick's offices in New York, Milan and London.

During the period between 2005 and 2010, Peter co-led the Orrick team representing Telenor ASA and its affiliates in four arbitration proceedings in New York and Geneva, two of which resulted in final awards, and numerous litigation proceedings in the Southern District of New York, Russia and Ukraine, including the proceedings to enforce an arbitration award that led to the decision by the United States Second Circuit Court of Appeals in Telenor Mobile v. Storm LLC et al., 584 F. 3d 396 (2d Cir. 2009). The American Lawyer noted that "[t]he interplay between courts, tribunals, and -- potentially -- treaty panels is showcased in the contest for Russian mobile phone operator VimpelCom between Alfa and Norway's Telenor ASA." Those arbitrations were recognized as among the top 10 arbitrations in The American Lawyer Arbitration Scorecard for 2007. The Economist described the dispute as "one of Russia's longest-running and most bitter boardroom battles."


Michelle O'Meara Managing Associate Complex Litigation & Dispute Resolution

Los Angeles

Michelle O'Meara, a managing associate in the Los Angeles office, is a member of the Complex Litigation and Dispute Resolution Group.

During law school, Michelle was a summer law clerk at Orrick, served as an extern at the Department of Justice, taught a writing course to first year law students, was a research assistant for Samuel Tyler Research Professor of Law Michael Selmi, and was a member of the George Washington University Law Review.


Anne O'Neill Partner Hotels, Resorts & Entertainment, Real Estate


Anne O'Neill, a partner in the London office, is head of Orrick’s UK Real Estate Practice and a member of Orrick's Management Committee.

Her practice focuses on commercial property work with particular emphasis on acquisitions, development and complex joint ventures. She is an expert in shopping centre development and management.

Anne is "a good negotiator and explains clearly and helpfully" and "often advises on significant real estate development matters in the housing sector."

Chambers UK ranks Anne as a leading individual for her expertise in the London social housing market and Legal 500 UK recognises her as a persuasive negotiator and notable practitioner with local authorities and registered providers.

Clients describe Anne as "responsive and commercial" and able to "articulate complex issues simply and concisely" whilst "providing in-depth knowledge and understanding which ensures we get the best and most appropriate advice." Chambers UK sources say "she is an absolutely exemplary lawyer," who is "proactive and leads her team really well."


Jonathan Ocker Partner Compensation & Benefits, Corporate

San Francisco

Jon Ocker is chair of Orrick’s destination Compensation and Benefits group. He specializes in advising public companies, boards of directors and high profile executives on compensation and corporate governance issues.

Jon is often referred to as the “CD&A/Say on Pay Doctor.” Jon is the only lawyer known to have represented chip war adversaries Intel and Advanced Micro Devices simultaneously. When Jon advises clients to not do something, they generally listen.

Jon is also the founder of Orrick’s Global Corporate Solutions consisting of global employment, global equity, global retirement and Verbatim’s global subsidiary maintenance. The signature of these solutions is their unique “global services” single point of contact, strong project management and fixed fee approach to working together with multinational clients to achieve their objectives as a virtual in-house resource in more than 130 jurisdictions.

Before joining the firm, Jon was a partner in the Employee Benefits Practice Group of Pillsbury, Madison & Sutro LLP and was associated with the Kirkland & Ellis firm in Chicago, Illinois.


Nnanna F. Ogbu Managing Associate Public Finance, School Finance

San Francisco

Nnanna F. Ogbu, a managing associate in the San Francisco office, is a member of the Public Finance Department. Nnanna advises cities, counties, school districts, community college districts, special districts, joint powers authorities, nonprofit public benefit corporations and underwriters.

Nnanna has served as bond counsel, disclosure counsel and underwriters’ counsel in connection with numerous tax-exempt and federally taxable financings throughout the State of California. He focuses his practice on transactions structured as general obligation bonds, lease revenue bonds, certificates of participation, revenue bonds, tax and revenue anticipation notes and bond anticipation notes and various other short-term and long term obligations.

Prior to joining Orrick’s San Francisco office in 2015, Nnanna practiced public finance law as an associate with Hawkins Delafield & Wood LLP in Los Angeles, California.


Yumiko Ohta Partner Employment Law & Litigation, Executive Compensation


Yumiko Ohta, partner in the Orrick's Tokyo office, is a member of the Employment Law Group. Ms. Ohta focuses mainly on employment law advice as well as various corporate transactions including compliance, corporate governance, mergers and acquisitions, joint venture, litigation and general corporate transactions.

Ms. Ohta also has international trade expertise in areas such as customs rules and export controls.

Before joining Orrick, Ms. Ohta 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. Also, she has experience serving as an outside 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.


Alex Okuliar Partner Antitrust & Competition, Antitrust/Intellectual Property

Washington, D.C.

A litigator and former enforcer at both the Federal Trade Commission and DOJ Antitrust Division, Alex offers clients insightful counseling and advocacy before federal and state antitrust authorities. Alex focuses on technology, energy, and finance, but his work extends to many other important sectors of the economy.

Alex divides his practice between transactions, counseling, and litigation. From 2012-2015, Alex served as antitrust and competition advisor to FTC Commissioner Maureen Ohlhausen, counseling her on the agency's numerous investigations, enforcement actions, and policies. He also engaged with enforcers outside the United States on key policy issues, including the proper role of antitrust analysis in intellectual property disputes. Earlier, from 2010-2012, Alex was a trial attorney at the DOJ Antitrust Division focused on technology and finance. 

In addition to his government work, Alex has more than a decade of experience in private practice. He has defended the transactions of domestic and international technology, media, and energy clients before antitrust agencies and represented class action defendants in federal and state court litigation around the United States. Before law school, Alex co-founded and sold an online technology company.


Eric R. Olah Associate White Collar, Investigations, Securities Litigation & Compliance


Eric joins the firm after completing judicial clerkships with the Chief Judge of the Eastern District of California, the Magistrate Judges of the Eastern District of California, and the Chief Judge of the United States Court of Appeals for Veterans Claims. 

He graduated in the top 5% of his class and with Order of the Coif honors from the University of California, Davis School of Law in 2013. He is also an honors graduate of the University of California, San Diego.

Joanna Oleniuk Associate Corporate, Technology Companies Group


Joanna Oleniuk is an associate in the London office and a member of the Technology Companies Group.

Joanna's practice focuses primarily on transactional and advisory work in respect high growth technology companies and venture capital firms.

Prior to joining Orrick, Joanna has worked at a venture capital fund in Berlin and has a particular interest in Central and Eastern Europe.


Bola Oloko Partner Structured Finance

New York

Bola Oloko is a structured finance lawyer based in Orrick’s New York office, focused on the financing, acquisition and disposition, and securitization of financial assets. He has a particular emphasis on commercial mortgage loans and commercial mortgage-backed securities (CMBS).

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 multi-lender CRE transactions (including pari-passu and A/B loan arrangements), secondary loan trading transactions (LSTA and non-LSTA), ISDA derivatives transactions, and securitization litigation and disputes, including loan repurchase claims and derivatives-related disputes.

Prior to joining Orrick, Bola was of counsel at Winston & Strawn, where his practice was focused on real estate capital markets and structured finance/securitization.