John Williams

Mark Sperotto is a partner in the London office of Gibson, Dunn and Crutcher and a member of the Corporate Transactional practice group. Mr. Sperotto has broad experience in both the UK and Italian markets, covering all aspects of corporate, private equity and investment banking with a focus on cross-border M&A, leveraged buy-outs, fund establishment and international corporate finance and equity capital markets transactions. Mr. Sperotto’s experience extends to advising private equ...

Al Gourley is a Partner at the firm’s London office. He is a globally-recognised resource lawyer, having led many UK and Canadian initial public offerings, secondary and alternative finance transactions, as well as mergers and acquisitions, in the resource sector, particularly cross-border transactions involving Europe, Africa, Australia and Canada. Al is also the Chairman of the World Initiative of Mining Lawyers based in Europe. Al is known for his knowledge of “pure” mini...

Andrew Savage focuses his practice on international commercial and finance litigation and international arbitration. Over a period of more than 25 years he has a gained a wealth of experience across all sectors and industries, including finance, insolvency, energy, insurance (for policy holders), commodities, shipping, construction, IT and art theft. Much of his casework has involved dealing with issues of fraud and corruption and the need for global asset tracing and international enforcement.

Aymen Mahmoud is the co-head of the London Finance, Restructuring and Special Situations Group. He focuses his practice on complex debt financing transactions for private equity funds and their portfolio companies, hedge funds, corporate borrowers and issuers and other financial institutions including banks, direct lenders, family offices and other alternative sophisticated capital. His experience includes acting in respect of direct lending, leveraged buyouts, domestic and cross-border syndi...

Ingrid Gubbay is a top attorney recognized by Best Lawyers in the practice area(s) of Environmental Law. Ingrid, who practices law in London, United Kingdom, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Ingrid is held by other top lawyers in the same geographic and legal practice area.

Penny Madden is an English qualified Queen’s Counsel and serves as Co-Partner-in-Charge of the London office at Gibson, Dunn & Crutcher. She is Co-Chair of the International Arbitration Practice Group and a member of the firm’s Transnational Litigation Practice Group. She has a wide range of experience in all key aspects of international arbitration with particular expertise in shareholder, telecommunications, SPA, energy, international trade and insurance disputes. She repres...

Rob Day is a partner in Proskauer’s Corporate Department and a member of our Private Equity Transactions, Mergers & Acquisitions and Sports Groups. Rob’s practice focuses on public and private M&A, leveraged buyouts and joint ventures, private equity and portfolio company transactions. His clients include global corporations, asset managers and private equity houses, advising on their strategically important transactions across financial services, consumer, sports, media a...

Mark's practice covers cross border inward investment, syndicated lending, structured export credit finance, structured trade and commodity finance, debt restructurings and asset finance. Mark is recognized in The Legal 500 UK as "excelling" in structured export credit transactions and is praised for his "commercial and user-friendly approach."Mark advises on ESG financings including hospitals, clean energy and transportation.Mark also advises on financial crime, modern slavery, bribery and c...

For more information, please visit www.gibsondunn.com/lawyer/nikpay-ali/ .

Clive Wells is a top attorney recognized by Best Lawyers in the practice area(s) of Banking and Finance Law. Clive, who practices law in London, United Kingdom, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Clive is held by other top lawyers in the same geographic and legal practice area.