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  • Tax
  • Energy
  • Infrastructure
  • Renewable Energy
  • Capital Markets
  • M&A and Private Equity

Michael J. Masri Partner Tax, Energy

New York

Mike is a transactional lawyer whose principal areas of practice are tax, energy and infrastructure.

He regularly advises his clients on energy tax credits, government incentive programs, project developments and financings, mergers and acquisitions (M&A), and all forms of leasing transactions. Mike represents investors and developers in tax equity financings across the renewable energy sector. He also assists clients in a broad range of federal income tax matters, including domestic and cross-border M&A, restructurings, financings, private equity and securities offerings.

  • D: +39 02 4541 3845


  • M&A and Private Equity
  • Corporate
  • Nonprofit Organizations

Nicoletta Massucci Associate M&A and Private Equity, Corporate


Nicoletta Massucci, an associate at in the Milan office, is a member of the European Corporate Group. Nicoletta focuses on administrative and civil law, especially in respect of family, debt recovery and commercial litigation.

She also carries out activities and consulting for national and international non-profit organizations.

Nicoletta qualified as a lawyer in 1978. Prior to joining Orrick, she worked at Studio Legale Tributario in Milan, a law firm associated with Ernst & Young International.



  • Infrastructure
  • Energy
  • Transportation Finance
  • M&A and Private Equity

Daniel Mathews Partner Infrastructure, Energy

New York

Dan manages a leading practice in project development, acquisitions, divestitures and financings in the energy and infrastructure sectors. He currently leads Orrick's Energy and Infrastructure Sector (one of the firm's three focus areas, along with technology and finance), and also serves on Orrick’s Board of Directors.

His key clients include major strategic and financial sponsors who have been involved in many of the largest and highest profile PPP and project development transactions over the past 20 years. Dan advises clients on Public-Private Partnerships, large-scale, complex project financings, and acquisitions and divestitures of projects and project portfolios, leading a team that has the depth and breadth to deliver excellence in every phase of a project, including development, construction, financing and operations, as well as providing leading M&A, restructuring and tax advice.   His key clients include major strategic and financial sponsors who have been involved in many of the largest and highest profile PPP and project financings over the past 25 years.

Dan has long been recognized as a leading practitioner in publications such as Chambers USA (every year since 2005), The Legal 500 and others. Clients described him in Chambers as the “best in the business" and added that "he has an encyclopedic memory about all the deals in the market and a negotiating style that solves problems rather than creating them.”

Dan advises on projects spanning the infrastructure sector, including toll roads, rail, airports, ports, thermal and renewable energy generation, transmission infrastructure, telecommunications infrastructure, and water and waste facilities.



  • Derivatives
  • Structured Finance
  • Energy
  • Infrastructure

Nikiforos Mathews Partner Derivatives, Structured Finance

New York

Mr. Mathews, a partner in Orrick’s New York office, serves as Global Co-Head of the Derivatives group. He is also a member of the Structured Finance, Banking and Finance, and Energy and Infrastructure groups.

His practice focuses on representing financial institutions, governmental and regulated entities, hedge funds and corporate end-users in structuring and negotiating a broad range of fixed income, foreign exchange, commodity, energy and credit derivative products. Among other things, he has successfully negotiated numerous domestic and cross-border hedging transactions relating to leveraged loans and infrastructure transactions. In addition, Mr. Mathews has significant experience in foreign exchange and fixed income prime brokerage issues, as well as various structured products. He also regularly advises clients on derivatives regulation, including rules relating to the central clearing, exchange trading, reporting, recordkeeping and other requirements of the Dodd-Frank legislation, as well as the negotiation of related documentation.

Mr. Mathews is lead editor of Orrick’s publication, Derivatives in Review, which periodically highlights important legal, regulatory and other newsworthy developments in the area of derivatives. He has also published articles in several journals, including on rating agency hedge criteria in connection with structured finance transactions.

Before joining Orrick, Mr. Mathews was vice president and assistant general counsel at Goldman, Sachs & Co. and director and counsel at UBS AG. He also served as a law clerk to the Honorable Nicholas Tsoucalas of the United States Court of International Trade.

From 1999 to 2007, Mr. Mathews held a commission as a Captain in the United States Army Reserve, where he was qualified to practice as a Judge Advocate. A veteran of both Operations Iraqi Freedom and Enduring Freedom, he served as an Operational and Administrative Law attorney in Kuwait, Iraq and Afghanistan.



  • International Arbitration & Dispute Resolution
  • Complex Litigation & Dispute Resolution
  • Employment Law & Litigation
  • Antitrust & Competition

Haruka Matsumoto Senior Associate International Arbitration & Dispute Resolution, Complex Litigation & Dispute Resolution


Haruka Matsumoto is a senior associate and member of the Complex Litigation and Dispute Resolution Group in the Tokyo office.

Haruka focuses on civil and commercial disputes, compliance, labor and employment, and antitrust related matters, in addition to insurance and insolvency for both domestic and non-Japanese companies.

She also participates in the publication of reports on Japanese and foreign employment and labor laws.

Prior to joining Orrick’s Tokyo office, Haruka was an associate at Nagasawa Law Offices.



  • Employment Law & Litigation

Anna Matsuo Career Associate Employment Law & Litigation

New York

Anna Matsuo's practice focuses on advising and counseling employers on a wide range of employment issues and defending employers in litigation before state and federal courts and administrative agencies.

Anna defends employers against a range of employment claims, including discrimination, harassment, retaliation, wrongful discharge, breach of contract, and wage and hour violations. She also provides preventive counseling to employers including advising on compliance issues, preparing employee handbooks and policies, advising on personnel matters including hiring and firing, and drafting employment contracts.

Before joining the firm, Anna practiced at national and regional law firms where she represented management in employment litigation.



  • Banking & Finance
  • Energy
  • Infrastructure
  • Restructuring
  • Latin America

Andrew Mattei Senior Counsel Banking & Finance, Energy

New York

Andrew Mattei, a partner in the New York office, is a member of the Banking & Finance group. Andrew represents both domestic and non-U.S. commercial banks and investment banks in negotiation of complex leveraged and investment grade lending transactions. He has a wide range of experience in first lien/second lien financing and negotiation of intercreditor agreements.

Andrew has extensive experience in cross-border multi-currency, multi-borrower financings and has been the lead attorney in acquisition leveraged buy-outs, tender offer financings, tax free spin-off financings and M&A related work.

Before joining Orrick, Andrew was a partner in the Finance Group at Allen & Overy LLP. Prior to that, he was a partner at Mayer Brown, LLP.


  • Employment Law & Litigation

Sara Mauger Associate Employment Law & Litigation


Sara Mauger is an Employment lawyer based in Orrick’s Paris office.

She advises French and international groups on all French employment and labor law matters. In particular, on the following matters: company restructurings, merger and acquisition transactions, transfer of activity, collective and individual relationships, hiring and termination of top managers, litigation

 Prior to joining Orrick, Sara worked as a legal intern with the Employment team of CMS Francis Lefebvre Avocats in 2017 and 2019, of Lagardère Group, at Fidal and also in the SynerCiel Company.



  • Intellectual Property

Amanda Maya Associate Intellectual Property

Silicon Valley

Amanda Maya is an Intellectual Property Litigation Associate at Orrick’s Silicon Valley Office. 

Amanda works on matters involving trade secrets, copyright infringement, and complex civil litigation. Her experience includes motion practice, preparing witnesses for their depositions, and working with experts. In addition to her intellectual property practice, Amanda also maintains a pro bono practice centering on matters concerning immigration.

Amanda is a graduate of the University of California, Berkeley School of Law where she served as Co-Chairperson of the Board of Advocates. While in law school, she served as the Recruiting Coordinator for La Raza Law Students Association, and she participated in the Board of Advocates Mock Trial program. She also was a law clerk in the Civil Division at the United States Attorney's Office.

Amanda graduated with honors from Cornell University with a Bachelor of Science in Industrial and Labor Relations. While at Cornell, she interned at the Civil Rights Division at the Department of Justice.



  • Securities Litigation, Class Actions and Shareholder Derivative Lawsuits
  • Government Investigations and Enforcement Actions
  • Internal Investigations
  • White Collar Criminal Defense
  • Financial Services Litigation
  • Global Compliance & Regulatory

Andrea Mazingo Managing Associate Securities Litigation, Class Actions and Shareholder Derivative Lawsuits, Government Investigations and Enforcement Actions

Los Angeles

Andrea (Andi) Mazingo represents financial institutions, institutional investors, and public and private corporations in all stages of complex, high-stakes disputes.

Andi has experience defending clients in government investigations and enforcement actions, consumer class actions, shareholder derivative litigation, merger litigation, stock drop litigation, and litigation prosecuted by institutional investors. She also is practiced in navigating internal investigations, SEC investigations, and white collar criminal matters. Andi has appeared in federal and state courts on behalf of her clients and is practiced in settling lawsuits in their early stages prior to extensive discovery.

Andi is familiar with the legal environment for soliciting investors, entering into mergers and other transactions, and making disclosures to investors, the public, and regulators, including those in offering documents and in filings with the SEC. She also is familiar with laws relating to corporate accounting, revenue recognition, and the fiduciary duties that officers and directors owe to investors. Andi is passionate about providing defense that is conscious of her clients’ business, reputational, and social needs.

Andi’s pro bono practice is focused on affirmatively and defensively seeking asylum on behalf of refugees, including those escaping domestic violence or LGBTQ persecution. While attending law school, Andi worked in Bluhm Legal Clinic's Investor Protection Center, where she engaged in FINRA arbitration and mediation on behalf of defrauded investors. Also during law school, Andi worked for the Los Angeles District Attorney’s Appellate Division defending against improper habeus corpus petitions as well as for the Cook County Public Guardian’s Office representing children taken into county custody for parental abuse or neglect.



  • Technology
  • M&A and Private Equity
  • Corporate
  • Blockchain and Cryptocurrency

Attilio Mazzilli Partner Technology, M&A and Private Equity


Attilio Mazzilli is a partner in the Milan office, member of the international Technology Companies Group and Head of the Italian Tech Group.

He focuses his practice on advising high growth technology companies and Venture Capital firms in several areas, including corporate and securities law, mergers and acquisitions, and listings. Several standout technology companies and their founders have turned to Attilio, who currently represents the same at all stages of their life-cycle.