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740

Practice:

  • Energy & Infrastructure Sector
  • Energy & Infrastructure
  • Energy
  • Infrastructure
  • Renewable Energy
  • Mergers & Acquisitions
  • 稅務

Mark Weitzel Partner

San Francisco

Mark has a finance, tax and corporate background, and focuses on structuring complex equity and debt investments, and negotiating investment, shareholder and joint venture agreements. He has a particular focus on tax and cash equity financing of renewable energy projects, including in the solar and wind space.

Mark is a recognized leader in the field. He is the former co-chair of Orrick’s Energy & Infrastructure practice, and has been named by Chambers as one of “America’s leading energy lawyers”, described by clients as “a standout.” He is also highlighted in The Legal 500 USA as a leading individual in the areas of energy: renewable/alternative and is highlighted in the conventional power category. Euromoney has recognized Mark as one of the “world’s leading project finance lawyers” and one of the “world’s leading energy and natural resource lawyers.” He has also been recognized by Best Lawyers in America for project finance law, by The Legal 500 as a leading project finance lawyer, and has been a Law360 Energy MVP. Mark is a frequent speaker on energy project and infrastructure investments.

466036

Practice:

  • Financial Services Litigation
  • White Collar, Investigations, Securities Litigation & Compliance
  • Complex Litigation & Dispute Resolution
  • 證券訴訟、集體訴訟與股東代表訴訟

Harry McAlevey Managing Associate

New York

Harry has broad experience representing a wide array of clients in all stages of litigation. He's worked with clients in bet-the-company disputes from the pre-litigation stage through motion practice, discovery, expert depositions, summary judgment motions, extensive pre-trial preparations, trials, and appeals. Separate from his successes in both state and federal litigation, Harry has also helped guide clients big and small through arbitration disputes.

Prior to joining Orrick, Harry worked as a litigation associate at a major international law firm in New York.

While in law school, Harry served as articles editor for the Georgetown Law Journal, interned at the U.S. Attorney's Office for the Southern District of New York, and represented inmates as part of GULC's Death Penalty Practicum. Harry won Georgetown's 68th Annual Beaudry Moot Court Competition and served as coach and board member of the Appellate Advocacy team. Prior to law school, Harry worked as a trial preparation assistant with the Bronx District Attorney's Office and as an intern at the United Nations.

Practice:

  • International Trade and Investment
  • Strategic Advisory & Government Enforcement (SAGE)

Maria Sergeyeva Senior Associate

Washington, D.C.

Maria's previous experience as a member of the Mergers and Acquisitions group is instrumental in her reviews of the trade aspects of various M&A and other cross-border transactions.  

Maria draws upon her experience in Washington, D.C., Moscow (Russia) and Almaty (Kazakhstan) to approach her work with a broad perspective on international trade-related and other matters. Prior to joining Orrick, Maria worked at the Office of the General Counsel of a multilateral development bank, handled tax and legal matters at one of the Big Four accounting firms, and oversaw the design and implementation of an export compliance program for an international development firm and a U.S. government contractor.

Practice:

  • Mergers & Acquisitions
  • Private Equity
  • Energy & Infrastructure
  • Infrastructure

Marc Diab Maalouf Senior Associate

Paris

Marc advises investment funds, industrial groups, listed companies, and startups, both French and international, on all aspects of business law, particularly in the context of acquisitions, disposals, mergers, reorganizations, and strategic partnerships. 

He is particularly active in the infrastructure, renewable energy, and new technology sectors, both in France and internationally.

In 2025, the international guide Legal 500 EMEA named him in the Key Lawyer category in Private equity: LBO and commented "high-quality deliverables; clear, didactic communication; strong proposals; proactive" and "serious while being relaxed in interactions, appreciable in the execution phase under pressure".

465979

Practice:

  • Technology & Innovation Sector
  • Technology Companies Group
  • Life Sciences & HealthTech

Mark Solakian Partner

Boston

With more than three decades of experience advising both private and public companies—and having served as a senior in-house executive across multiple pioneering biotech and life sciences companies—Mark brings a uniquely business minded perspective to his counsel and delivers a rare blend of legal acumen and executive experience that positions him as a trusted strategic partner to entrepreneurs, companies and investors.

Mark is a veteran of hundreds of successful venture capital financings, technology and licensing transactions, strategic alliances, corporate governance matters, mergers and acquisitions, and public and private equity and debt offerings on behalf of companies in every health and biotech related vertical.

Before joining Orrick, Mark was a partner and co-founder of the Wilson Sonsini Boston office. He previously held senior executive roles at Affymetrix (AFFX), Helicos Biosciences (HLCS) and Joule Global Holdings, where he oversaw legal strategy, led public offerings and financings, negotiated strategic partnerships and licensing transactions, and managed critical business functions including HR, finance, and government affairs.

Mark and his wife, Christine, have been married for more than 25 years and have two adult children.

452926

Practice:

  • Mergers & Acquisitions
  • Private Equity

Maria Teodorescu Associate

Munich

She acts on corporate transactions including leveraged buy-outs, management buy-outs, minority participations and expansion or growth financings as well as M&A transactions, often with cross-border aspects.

Before joining Orrick, she had been an associate in the private equity group of a U.S. headquartered law firm. As part of her legal clerkship, Maria worked for another U.S. law firm and a leading German law firm, among others.

Practice:

  • Antitrust & Competition
  • International Trade and Investment
  • Strategic Advisory & Government Enforcement (SAGE)

Dr. Lars Mesenbrink Partner

Düsseldorf

His background in economics, Chinese language skills and extensive international experience add to his excellent legal knowledge and allow him to advise his clients on a comprehensive basis.

Lars has represented clients before the European Commission and the German Federal Cartel Office in all areas of competition law, inter alia including mergers, compliance, cartels, litigation and abuse of dominance.

In these areas, he provides companies with innovative solutions on high-profile complex matters including private damages actions and cartel investigations, often involving multiple jurisdictions.

Lars also pursues international trade and compliance matters, including matters involving foreign investment filings in Germany.