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434268

Practice:

  • Data Centers
  • Renewable Energy
  • Solar Energy
  • Wind Energy
  • Offshore Wind
  • Energy Storage
  • Energy & Infrastructure
  • Energy
  • Power

Patrick Ferguson Partner

San Francisco

Patrick Ferguson brings two decades of experience guiding clients through the development, financing, acquisition, and sale of some of the most innovative energy projects in the United States. His practice spans a wide range of technologies—including solar, wind, geothermal, energy storage, and natural gas peaking and combined-cycle plants—and he is recognized for his ability to navigate complex regulatory, commercial, and transactional challenges.

Patrick advises project sponsors at every stage of the development lifecycle. His work includes negotiating power purchase and long-term offtake agreements, physical and financial swaps, interconnection and engineering arrangements, operations and maintenance agreements, and management services agreements. He has led the negotiation of many gigawatts of energy storage tolling and capacity agreements with utilities as well as commercial and industrial offtakers, and regularly counsels major power companies on energy and capacity sales under WSPP, EEI, and ISDA contracting frameworks.

Patrick also plays a leading role in the rapidly expanding data center sector. He represents power producers and data center companies in the development of hyperscale facilities across the country, advising on power sleeving arrangements with utilities and behind-the-meter energy solutions. He is the editor of Megawatts to Megabytes: Orrick’s 2025 Guide to Developing, Financing & Powering Data Centers, the firm’s definitive publication on data center infrastructure and energy strategy.

A recognized authority in energy regulation, Patrick has been at the forefront of many of the industry’s most significant and groundbreaking projects. Clients recommend him in Chambers USA for his “expert regulatory and commercial advice” and his “experience across a range of assets including solar and geothermal power plants and transmission lines.” He is ranked as a market leader by Chambers USA, Legal 500 USA, and Best Lawyers.

452945

Practice:

  • International Arbitration & Dispute Resolution
  • Complex Litigation & Dispute Resolution

Ramona Sorgenfrei Managing Associate

Düsseldorf

She has experience in telecommunications licensing disputes and litigating FRAND objections and D&O disputes, as well as in disputes under the UN Convention on Contracts for the International Sale of Goods.

In addition to experience in arbitration proceedings under the rules of the ICC, LCIA, UNCITRAL VIAC and the Hungarian Chamber of Commerce (ACHCCI), Ramona acts as administrative secretary in DIS arbitrations. 

She is a lecturer in arbitration and international commercial law at the University of Bayreuth where she also coaches the university's team in the Willem C. Vis Moot. Further to her legal studies, Ramona has also completed a university degree in economics.

During her education, she worked in US firms in Germany and Paris, where she deepened her knowledge of arbitration, litigation, and dispute resolution. Prior to joining Orrick, Ramona worked as a litigation lawyer for a magic circle law firm in Germany, including patent litigation involving patent infringement, nullity, and patent vindication proceedings, particularly in the telecommunications and automotive industries.

452945

Practice:

  • International Arbitration & Dispute Resolution
  • Complex Litigation & Dispute Resolution

Ramona Sorgenfrei Managing Associate

Düsseldorf

She has experience in telecommunications licensing disputes and litigating FRAND objections and D&O disputes, as well as in disputes under the UN Convention on Contracts for the International Sale of Goods.

In addition to experience in arbitration proceedings under the rules of the ICC, LCIA, UNCITRAL VIAC and the Hungarian Chamber of Commerce (ACHCCI), Ramona acts as administrative secretary in DIS arbitrations. 

She is a lecturer in arbitration and international commercial law at the University of Bayreuth where she also coaches the university's team in the Willem C. Vis Moot. Further to her legal studies, Ramona has also completed a university degree in economics.

During her education, she worked in US firms in Germany and Paris, where she deepened her knowledge of arbitration, litigation, and dispute resolution. Prior to joining Orrick, Ramona worked as a litigation lawyer for a magic circle law firm in Germany, including patent litigation involving patent infringement, nullity, and patent vindication proceedings, particularly in the telecommunications and automotive industries.

466397

Practice:

  • Mergers & Acquisitions
  • Private Equity

Bruno Romagnoli Partner

Paris

Bruno has particular experience in providing transactional advice on mergers and acquisitions-related issues, as well as securities and stock market regulation and corporate law.

Bruno works with French and multinational groups from a wide range of public and private sectors.

Bruno is also the founder of “HEAD Afrique”, a think-tank on legal practice on the African continent.

Before joining Orrick, he spent six years in the corporate team at a leading international law firm, and prior to that was also at another global law firm.

466397

Practice:

  • Mergers & Acquisitions
  • Private Equity

Bruno Romagnoli Partner

Paris

Bruno has particular experience in providing transactional advice on mergers and acquisitions-related issues, as well as securities and stock market regulation and corporate law.

Bruno works with French and multinational groups from a wide range of public and private sectors.

Bruno is also the founder of “HEAD Afrique”, a think-tank on legal practice on the African continent.

Before joining Orrick, he spent six years in the corporate team at a leading international law firm, and prior to that was also at another global law firm.

Practice:

  • Mergers & Acquisitions
  • International Arbitration & Dispute Resolution
  • Complex Litigation & Dispute Resolution

Siegfried Elsing, Prof. Dr. LL.M. (Yale) Partner

Düsseldorf

He has acted as counsel, presiding arbitrator, sole arbitrator, or chairman in more than 300 arbitration proceedings, including ad hoc proceedings and arbitrations under the rules of the leading arbitration institutions.

As counsel, he represents private investors, international corporations, sovereign states, and state-owned enterprises in a range of significant, complex, and often cross-border disputes.

In addition to counsel work and acting as an arbitrator, Siegfried also acts as an expert witness before German courts as well as courts in the United States and the United Kingdom and before regulatory institutions.

His experience includes disputes in the areas of M&A, energy, investment protection, engineering and construction, financing, joint ventures, and intellectual property.

He is admitted to practice as an attorney-at-law in both Germany and New York.

Chambers Global 2024 describes Siegfried as a "star individual" who is "often appointed as arbitrator in complex international arbitrations" and is also "a leading practitioner in the field of investment arbitration" with "extensive experience as an arbitrator in investment law cases".

Siegfried was a member of the Advisory Board of the American Arbitration Association (2009 to 2020) and a member of the Panel of Conciliators of the International Centre for Settlement of Investment Disputes (ICSID) (2011 to 2017). He was a member of the Board of the German Arbitration Institute (DIS) (2012 to 2022) and has been a member of the DIS Council (since 2022). He was also Chairman of the Mediation Committee of the International Bar Association (IBA) (2007-2008).

He is co-editor of the German Arbitration Journal (Zeitschrift für Schiedsverfahren (SchiedsVZ)). He regularly lectures and publishes on international arbitration and comparative law. Siegfried is also honorary professor at the Faculty of Law at Heinrich Heine University Düsseldorf, where he has been teaching international commercial arbitration and international civil procedure law for 25 years. Since 2013, he represents the Grand Duchy of Luxembourg as Honorary Consul in North Rhine-Westphalia.

Siegfried Elsing co-founded the German law firm Hölters & Elsing in 1989 and has overseen the merger with Orrick in 2008.

Practice:

  • Mergers & Acquisitions
  • International Arbitration & Dispute Resolution
  • Complex Litigation & Dispute Resolution

Siegfried Elsing, Prof. Dr. LL.M. (Yale) Partner

Düsseldorf

He has acted as counsel, presiding arbitrator, sole arbitrator, or chairman in more than 300 arbitration proceedings, including ad hoc proceedings and arbitrations under the rules of the leading arbitration institutions.

As counsel, he represents private investors, international corporations, sovereign states, and state-owned enterprises in a range of significant, complex, and often cross-border disputes.

In addition to counsel work and acting as an arbitrator, Siegfried also acts as an expert witness before German courts as well as courts in the United States and the United Kingdom and before regulatory institutions.

His experience includes disputes in the areas of M&A, energy, investment protection, engineering and construction, financing, joint ventures, and intellectual property.

He is admitted to practice as an attorney-at-law in both Germany and New York.

Chambers Global 2024 describes Siegfried as a "star individual" who is "often appointed as arbitrator in complex international arbitrations" and is also "a leading practitioner in the field of investment arbitration" with "extensive experience as an arbitrator in investment law cases".

Siegfried was a member of the Advisory Board of the American Arbitration Association (2009 to 2020) and a member of the Panel of Conciliators of the International Centre for Settlement of Investment Disputes (ICSID) (2011 to 2017). He was a member of the Board of the German Arbitration Institute (DIS) (2012 to 2022) and has been a member of the DIS Council (since 2022). He was also Chairman of the Mediation Committee of the International Bar Association (IBA) (2007-2008).

He is co-editor of the German Arbitration Journal (Zeitschrift für Schiedsverfahren (SchiedsVZ)). He regularly lectures and publishes on international arbitration and comparative law. Siegfried is also honorary professor at the Faculty of Law at Heinrich Heine University Düsseldorf, where he has been teaching international commercial arbitration and international civil procedure law for 25 years. Since 2013, he represents the Grand Duchy of Luxembourg as Honorary Consul in North Rhine-Westphalia.

Siegfried Elsing co-founded the German law firm Hölters & Elsing in 1989 and has overseen the merger with Orrick in 2008.

Practice:

  • Energy & Infrastructure
  • Energy
  • Infrastructure
  • Renewable Energy
  • Wind Energy
  • Solar Energy
  • Energy Storage
  • Power
  • Data Centers
  • Responsible Business

Teresa Hill Partner

Seattle

Focused on helping public and private companies in achieving their global “net zero” carbon commitments, Teresa has a particular emphasis on negotiating renewable energy power purchase agreements (PPAs). She has partnered with some of the largest corporate buyers of renewable energy, working to expand the global footprint of their energy portfolios in the United States, Latin America, Europe, Australia and Asia.

Teresa has extensive experience with wind, solar and storage projects and, specifically, the negotiation of development-related agreements, including virtually and physically settled renewable power purchase agreements.

Prior to joining Orrick, Teresa was a partner in the energy and infrastructure group of a global law firm and in the environment, land use and natural resources and renewable energy groups of a Portland-based law firm. She also clerked for Chief Justice Linda Copple Trout, the first woman appointed to the Idaho Supreme Court.

Practice:

  • Energy & Infrastructure
  • Energy
  • Infrastructure
  • Renewable Energy
  • Wind Energy
  • Solar Energy
  • Energy Storage
  • Power
  • Data Centers
  • Responsible Business

Teresa Hill Partner

Seattle

Focused on helping public and private companies in achieving their global “net zero” carbon commitments, Teresa has a particular emphasis on negotiating renewable energy power purchase agreements (PPAs). She has partnered with some of the largest corporate buyers of renewable energy, working to expand the global footprint of their energy portfolios in the United States, Latin America, Europe, Australia and Asia.

Teresa has extensive experience with wind, solar and storage projects and, specifically, the negotiation of development-related agreements, including virtually and physically settled renewable power purchase agreements.

Prior to joining Orrick, Teresa was a partner in the energy and infrastructure group of a global law firm and in the environment, land use and natural resources and renewable energy groups of a Portland-based law firm. She also clerked for Chief Justice Linda Copple Trout, the first woman appointed to the Idaho Supreme Court.

Practice:

  • White Collar Criminal Defense
  • Whistleblower & Corporate Investigations
  • White Collar, Investigations, Securities Litigation & Compliance
  • Strategic Advisory & Government Enforcement (SAGE)

Jean-Paule Castagno Partner

Milan

Jean-Paule has more than 20 years of proven experience in white collar and corporate investigation, managing all phases of crisis management, such as internal investigations – including those of a cross-border nature –, the court defence in the context of criminal proceedings and the sanction proceedings before the Supervisory Authorities, in the interests of both individuals and legal entities (according to the D. Legislative Decree no. 231/2001). Jean-Paule advises clients in high-profile and complex cases with specific reference to anti-money laundering, financial crimes, false accounting, bankruptcy offenses, tax crimes, corruption and bribery in both the public and private sector, environmental crimes, occupational health and safety offenses, intellectual property crimes, data protection and privacy crimes/cybercrime, and import/export sanctions.

Thanks to her broad experience in conducting internal investigation and assisting individuals and legal entities in criminal and sanctions proceedings, she has been involved in advising Italian and foreign companies to address potential compliance risks, in performing due diligence focused on risk management and compliance risk in the context of extraordinary transactions and IPOs as well as in preparing and updating compliance programs (adopted under Law No. 231/2001) and in leading relative training to the board and to the employees.

She has also been appointed as member and chairwoman of the surveillance committees (Organismo di Vigilanza) of many Italian and foreign companies.

Practice:

  • White Collar Criminal Defense
  • Whistleblower & Corporate Investigations
  • White Collar, Investigations, Securities Litigation & Compliance
  • Strategic Advisory & Government Enforcement (SAGE)

Jean-Paule Castagno Partner

Milan

Jean-Paule has more than 20 years of proven experience in white collar and corporate investigation, managing all phases of crisis management, such as internal investigations – including those of a cross-border nature –, the court defence in the context of criminal proceedings and the sanction proceedings before the Supervisory Authorities, in the interests of both individuals and legal entities (according to the D. Legislative Decree no. 231/2001). Jean-Paule advises clients in high-profile and complex cases with specific reference to anti-money laundering, financial crimes, false accounting, bankruptcy offenses, tax crimes, corruption and bribery in both the public and private sector, environmental crimes, occupational health and safety offenses, intellectual property crimes, data protection and privacy crimes/cybercrime, and import/export sanctions.

Thanks to her broad experience in conducting internal investigation and assisting individuals and legal entities in criminal and sanctions proceedings, she has been involved in advising Italian and foreign companies to address potential compliance risks, in performing due diligence focused on risk management and compliance risk in the context of extraordinary transactions and IPOs as well as in preparing and updating compliance programs (adopted under Law No. 231/2001) and in leading relative training to the board and to the employees.

She has also been appointed as member and chairwoman of the surveillance committees (Organismo di Vigilanza) of many Italian and foreign companies.

Practice:

  • Employment Law & Litigation
  • Complex Litigation & Dispute Resolution

Mario Scofferi Partner

Milan

As a Partner in the Milan office and Head of the Italian Employment practice, Mario is member of the Employment International Group and focuses on all aspects of employment, agency, and self-employment relationships, advising clients in both litigation and out-of-court matters, including the assistance on his field in transactional deals.

Mario regularly assists clients with the negotiation of both employment and self-employment agreements, throughout the performance of such relationships and at their termination, with the aim of providing high-quality services grounded in rigorous analysis and close client interaction.

His clients operate in the tourism, services, finance, credit, chemical, tech, infrastructure and public administration sectors (including state-owned companies).

Mario has also developed considerable experience in managing companies’ relationships with their board members, as well as in disputes involving social security institutions.

He is the author of numerous articles on labor law published in professional journals.

Mario is admitted to the Milan Bar and is also a member of AGI – Italian Employment Lawyers Association – and of the Italian Journalists Association.