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  • Complex Litigation & Dispute Resolution

Adrienne Knecht Tierney Associate Complex Litigation & Dispute Resolution

San Francisco

Adrienne Tierney is an associate in the Complex Litigation and Dispute Resolution group in Orrick's San Francisco office.

Adrienne represents corporate clients and individuals in state and federal courts in various commercial matters, including white collar criminal defense and complex civil litigation.



  • Corporate
  • M&A and Private Equity
  • Antitrust & Competition

Dr. Nikita Tkatchenko Partner Corporate, M&A and Private Equity


Dr. Nikita Tkatchenko is a Partner in our Dusseldorf office and member of the M&A and Private Equity Group.

He advises mainly on M&A transactions, restructuring and general corporate law.

Furthermore, he has significant experience in antitrust and merger control law.

Prior to joining Orrick in 2011, Nikita worked at the German law firm Hengeler Mueller.


  • Technology Companies Group

Thomas Tobiason Spec Advisor-Global Corp Dev Technology Companies Group

San Francisco

Thomas H. Tobiason is a member of the Technology Companies Group, which advises high growth technology companies, venture capital firms and investment banks.

Tommy represents public and private high-tech and life science companies in the renewable energy, life science, mobile, Internet, display, semiconductor and other high-tech industries, focusing on formation, financing and general corporate counseling.

He has completed hundreds of venture capital financings as well as numerous acquisitions (representing both acquirers and sellers), public offerings (representing both issuers and underwriters) and commercial transactions.

Tommy, who spent most of his career based in California's Silicon Valley, also advises a number of entrepreneurs and companies doing business in China, Taiwan, Vietnam and India. He regularly advises on corporate governance and securities law compliance matters, including Sarbanes-Oxley counseling and compliance.

Tommy has represented numerous investment banking clients including Goldman, Sachs & Co., Merrill Lynch and Morgan Stanley. He has also represented numerous venture capital firms, including Matrix Partners, Maveron, Sequoia Capital, Steamboat Ventures, U.S. Venture Partners and Walden International.

Prior to joining the firm, Tommy was a director of Venture Law Group.



  • Corporate
  • Technology Companies Group

Ramin Tohidi Managing Associate Corporate, Technology Companies Group

San Francisco

Ramin Tohidi is a managing associate in the Technology Transactions and Licensing practice at Orrick, and a member of Orrick's Technology Companies Group.

Ramin focuses on technology transactions and other commercial and licensing matters. He helps clients maximize their intellectual property and technology portfolios in a variety of ways, including drafting, negotiating, and advising on development, production, supply, procurement, and other technology licensing arrangements. In addition, he advises clients on open source licensing and intellectual property issues in connection with mergers, acquisitions, and financing transactions.  He represents both mature and emerging companies in a variety of industries, including in SaaS, software, hardware, biotechnology, pharmaceuticals, information technology, and data intelligence.

Ramin previously served as in-house counsel at a public SaaS and software company in the Bay Area, where he advised on technology transactions, product and regulatory issues.  He also was an associate at Latham & Watkins LLP, where he focused on complex business and intellectual property related litigation.



  • Public Finance

Paul A. Toland Managing Associate Public Finance

San Francisco

Paul Toland is an attorney in the San Francisco office and a member of the firm's top-ranked Public Finance Department.

Paul's practice includes bond and issuer counsel work for tax-exempt and taxable financings, with a focus on revenue bonds, particularly multifamily housing revenue bonds issued by cities, counties, public authorities and joint powers agencies.

Paul also serves as special counsel to the California Statewide Communities Development Authority for its conduit housing financings.



  • Energy
  • Infrastructure
  • Oil & Gas
  • Master Limited Partnerships

Lisa Tonery Partner Energy, Infrastructure

New York

Lisa Tonery is widely recognized as an innovator in the natural gas regulatory arena. She has represented clients in the energy industry on regulatory strategy, compliance and transactional matters for more than 25 years.

Lisa focuses her practice on the development of energy infrastructure, including LNG terminals, natural gas pipelines and natural gas storage facilities, as well as related transactional and financing matters. She routinely advises companies on securing permits and authorizations for major energy projects and has extensive experience with proceedings before the FERC, the DOE, the U.S. Department of Transportation Pipeline and Hazardous Materials Safety Administration (PHMSA), and other agencies.

At the forefront of her field, Lisa helped a client obtain the first authorization issued by the DOE to export domestic natural gas as LNG to all trading partners, and represented the first bi-directional LNG terminals proposed in the United States in proceedings before the FERC.

Lisa has been recognized as a leading practitioner by both Chambers Global and Chambers USA for many years. In 2016, she was named an Energy & Environmental Law Trailblazer by the National Law Journal.



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

Michael Torpey Partner White Collar, Investigations, Securities Litigation & Compliance, Securities Litigation, Class Actions and Shareholder Derivative Lawsuits

San Francisco; New York

Michael Torpey, Managing Partner of the firm and a partner in the San Francisco office, is recognized for his expertise in SEC investigations, securities class actions and breach of fiduciary duty-related matters.

Mike was Orrick's Securities Litigation practice leader from 2004 to 2012.

He has the unique ability to look at corporate governance problems from a business perspective, to carefully navigate or avoid collateral consequences, and strategically win legal problems. He is frequently recognized for his expertise by Chambers, Super Lawyers and The Daily Journal.

Mike specializes in litigation involving the Private Securities Litigation Reform Act of 1995, The Securities Act of 1933, the Securities Act of 1934, the Uniform Standards Act and proceedings initiated by the Securities Exchange Commission, the National Association of Securities Dealers and other self-regulatory organizations.

Mike has extensive experience in litigation involving breaches of fiduciary duty and conducting various types of corporate investigations.



  • Employment Law & Litigation
  • Cyber, Privacy & Data Innovation

Julie Totten Partner Employment Law & Litigation, Cyber, Privacy & Data Innovation

Sacramento; San Francisco

Julie Totten is the Co-Leader of Orrick’s Global Employment Law and Litigation Practice Group. 

Julie, who has more than 20 years’ experience representing companies in high stakes litigation, is honored to be a Fellow of the College of Labor and Employment and she also serves as a Council Member of the American Bar Association Labor and Employment Law Section. Julie has achieved significant results for her clients and in 2014 she was recognized by Legal 500 as someone who "truly understands corporate politics and works with in-house counsel to understand the intersections of legal advice and business objectives." 

Julie represents employers in complex cases, including wage-and-hour class and collective actions, EEO claims and claims involving breach of contract and wrongful termination. She has also successfully represented clients involved in investigations and audits by the Department of Labor and the California Division of Labor Standards Enforcement, and she assists clients in developing compensation policies and compliance measures designed to reduce potential exposure. Julie also counsels and trains clients on a wide variety of employment law matters, including social media and employee privacy.



  • Banking & Finance
  • Capital Markets
  • Structured Finance
  • Energy

Hervé Touraine Partner Banking & Finance, Capital Markets


Hervé Touraine, partner in Orrick’s Paris office, is Head of Finance Europe.

Hervé represents French and international financial institutions, corporates, sponsors, investors, insurance companies, asset managers and alternative capital providers on French and cross borders transactions. He advises on banking, structured finance, securitization, and capital markets transactions.

Hervé has worked on numerous complex, strategic and/or innovative transactions (including many firsts in France and Europe) such as international securitization transactions, covered bonds, corporate structured bonds, project bonds, debt funds and the establishment of dedicated origination and refinancing platforms. He also acted on transactions for financing or refinancing purposes (including liquidity), and for off-balance sheet or regulatory capital purposes. As such, he has developed particular skills in handling multi-jurisdictions and multi-practices transactions.

He has developed a substantial experience in the energy and infrastructure sector in the context of financing and refinancing transactions, using classical bank structures as well as Euro PP, bond and project bond structures, specialized credit institutions and dedicated debt funds.

Hervé is described by his clients as a “key person” for structured finance deals, noting: “when we've got a problem, he's there. We know we can count on him”. Clients further comment: “He is dedicated and innovative, and an expert in is field. We see him as a business partner of ours, rather than a lawyer”.

Hervé is an active participant in drafting securitization and structured finance legislation and regulations in France. Hervé regularly publishes and speaks in relation to structure finance markets and related point of interest and deals.

Before joining Orrick in 2016, Hervé was a partner at Freshfields Bruckhaus Deringer LLP where he worked for 20 years, including 18 years as a partner.



  • Energy
  • Litigation & IP
  • Complex Litigation & Dispute Resolution
  • Intellectual Property
  • Employment Law & Litigation
  • International Arbitration & Dispute Resolution
  • Class Action Defense

Katherine Treistman Partner Energy, Litigation & IP


Katherine is an experienced trial lawyer whose practice focuses on complex commercial disputes in the energy industry, as well as in other sectors including technology (Hewlett Packard) and finance (Jefferies and many financial institutions and private equity funds), and she has handled antitrust, auditor liability, employment, and other commercial claims. Prior to joining Orrick, she worked at Susman Godfrey for 20 years, during which she represented both plaintiffs and defendants in high stakes commercial dispute in state and federal courts nationwide and in arbitration proceedings. Katherine has vast trial and pre-trial experience.

In her energy sector practice at Susman Godfrey, Katherine successfully defended the former CEO of a global oilfield services company (who is now the GC of Hewlett Packard) in a multimillion fraud claim against him and the company’s other officers brought by a leading investment management firm that loaned money to the company prior to its bankruptcy filing. She also had a long-time relationship with a global, natural gas compression services company, which she represented in various court proceedings and in a high-profile arbitration related to sales of gas compressors and related contracts.

Some of Katherine’s significant matters since joining Orrick are her current representations of Jefferies in a multi-million dollar fraud dispute in Fort Worth, Aeromexico in a $1.75 billion class action involving violations of California Invasion of Privacy Act, and Eni Petroleum in an appeal and retrial of $160 million judgment.

Katherine brings a unique perspective to Orrick. Having both prosecuted and defended complex commercial matters, she has great insight into plaintiffs’ lawyers thinking and strategy. She is also highly efficient, having worked on contingent fee and other results-based fee arrangements for much of her career.



  • Corporate
  • M&A and Private Equity
  • Latin America

Carlos Treistman Partner Corporate, M&A and Private Equity


Bringing years of international experience to his clients, Carlos Treistman’s practice focuses on cross-border mergers and acquisitions (M&A), privatizations, joint ventures, infrastructure development projects, and private equity transactions.

Carlos works with U.S. and foreign companies in such industries as oil and gas, power, mining, real estate, transportation, and telecommunications. Carlos serves as co-head of Orrick’s Latin America Practice and is the Office Leader for our Houston office.

For more than 20 years, Carlos has counseled clients in nearly every country in Latin America. Fluent in Spanish, he has a clear understanding of the nuances of handling business transactions throughout the region. Carlos acts as the lead relationship partner for several key multinational clients.

Chambers Global (2005-2017), Chambers Latin America (2005-2017) and Chambers USA (2009-2017) consistently recognize Carlos for his experience in cross-border M&A, Latin America investments and other international transactions, noting his “wealth of experience in the energy sector” and  "great knowledge and ability to translate between cultures."  Chambers client sources describe him as “great to work with as he is not just a knowledgeable legal partner, but also a good business partner,” and “very hard-working.”

In step with Orrick’s commitment to community service, he is a member of the advisory board of the board of directors of the Juvenile Diabetes Research Foundation International. For nearly a decade, he served on the board of directors for the Holocaust Museum Houston.



  • Capital Markets
  • Corporate
  • Equity Capital Markets
  • M&A and Private Equity
  • Technology Companies Group

Chris Trester Senior Associate Capital Markets, Corporate

Silicon Valley

Chris Trester is a Senior Associate in Orrick's Silicon Valley office and a member of the firm’s Mergers and Acquisitions (M&A) and Private Equity practice groups.

Chris has a broad range of practices which includes venture capital and public market financings, M&A, preparation of public company SEC reporting and disclosure, corporate governance and general corporate and business counseling for private and public companies.

Prior to joining Orrick, Chris was an associate at DLA Piper.

In addition to his legal experience, Chris was previously a Manager at PwC in their Transaction Services Group. In this role, he led clients through initial public offerings, private placements (144A), M&A and divestitures. Based on this experience, he regularly consults with his private and public clients on accounting issues they encounter during transactions.