Press Release

Patricia Mastropierro Named Haynes Boone Mexico City Office Administrative Partner

January 08, 2024

(en español)

Haynes and Boone, LLP is pleased to announce that Patricia Mastropierro has assumed the role of office administrative partner for the firm’s growing Mexico City office.

Patricia has been with the firm since 2001, practicing in the International and Aviation Groups. She regularly advises airlines in a broad range of matters, including setting up and maintaining operations as well as obtaining permits and airport authorizations across the globe. Patricia has represented one of the largest U.S. airlines in more than 35 jurisdictions globally, and she is regularly named to the Latin Lawyer 250 and Latinvex Top 100 Female Lawyers lists.

“It’s an honor to take on this leadership role for the firm,” Patricia said. “It is a privilege to help guide Haynes Boone’s efforts in helping clients move their operations into Latin America, and to continue helping Mexican clients find success in the United States and internationally.”

Haynes Boone’s Mexico City office relocated to an efficient, state-of-the-art new space at Chapultepec Uno on Paseo de la Reforma in 2022. The office also grew by three partners in 2023, including the promotion of two counsels in July and the addition of Transactional Corporate Finance Partner Diego Sanchez, who joined from Baker McKenzie in October.

Haynes Boone is among the most active U.S. law firms operating in Mexico, having served both international and Mexican clients with its affiliate, Haynes and Boone, SC, for almost three decades. The office’s bilingual roster includes lawyers and business professionals trained and licensed in both Mexico and the United States. They practice in a wide array of areas, with vast experience in cross-border and domestic transactions, banking, finance, real estate, energy, hospitality, tax, litigation, arbitration and more. Haynes Boone was ranked as one of the top international firms in Latin America by Latinvex in 2023, with the firm’s Aviation and Real Estate Practices ranked first overall in the region, and in the top 10 in Energy and Project Finance.

About Haynes Boone

Founded in 1970, Haynes and Boone, LLP provides a full spectrum of legal services across multiple sectors, including energy, financial services, private equity and technology. The firm’s 700-plus lawyers practice in 19 offices in California, Colorado, Illinois, New York, North Carolina, Texas, Virginia and Washington, D.C., as well as London, Mexico City and Shanghai. Haynes Boone was recognized in the 2022 BTI Consulting Group’s A-Team report, which identified firms commended by in-house counsel for superior client service, and it was ranked 21st in The American Lawyer’s 2023 Diversity Scorecard, which evaluated 228 participating firms by the diversity of their attorney populations. For more information, visit

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