Anthony O. Maceira Zayas

Leaders in Law endorses Anthony Maceira as our exclusively recommended Commercial Law expert in Puerto Rico. If you wish to get in touch with Anthony please use the contact information provided above.

Maceira is the Founding Member of MZLS. With a decade of experience in Government Services, Maceira has been involved in major reforms implemented in Puerto Rico since 2010 when he started as advisor to the Majority Leader of the Senate. Serving mainly as full service/external legal counsel to foreign companies doing business in Puerto Rico, Maceira has developed a robust commercial law practice, including but not limited to: civil litigation, appellate, corporate law and government services practice. Specializing in commercial law and privatization of services, Maceira’s experience in the Private Sector includes defense attorney in high profile cases such as: environmental cases, gambling industry cases, tax litigation, insurance litigation, banking cases, protesting and defending bid awards challenged in court and others. In addition, his private experience includes the negotiation of privatization services in areas such as mass transit, public safety and energy. In addition, Maceira has served as legal counsel and advisor to the former President of the Senate, the Minority Delegation of the Senate, Telecommunications Bureau, Energy Bureau, the Puerto Rico Fiscal Agency, amongst others.

Anthony obtained his JD from the Interamerican University of Puerto Rico, Magna Cum Laude, graduated from the International Legislative Drafting Institute of Tulane Law School and from the Project Management Course at Polytechnic University of Puerto Rico.

Prior to founding MZLS, Anthony served as Secretary for Public Affairs and Ports Authority Director for the Government of Puerto Rico. In addition, Maceira served in the Senate of Puerto Rico, as advisor to the Majority Leader 16th Assembly, Minority Leader 17th Assembly and President of the 18th Assembly.

During Anthony’s time as Secretary for Public Affairs he was the Government’s main spokesperson, oversaw all the communication efforts of the Administration and coordinated intergovernmental initiatives and efforts. During his tenure, Anthony worked with approving key legislation including amongst others: (1) the Puerto Rico Incentives Code (Law 60-2019); (2) the Puerto Rico GSA and Procurement Reform Act (Law 73-2019) which created a new Governmental body in charge of the procurement and acquisition of non-professional services and goods, and uniformed government procurement into a single set of rules; (3) the Energy Public Policy Act (Law 17-2019); (4) the Gaming Commission Act (Law 81-2019) which authorized sports betting in Puerto Rico, and centralized into a new single government entity the regulation of gambling, horse racing and other gaming industries and (5) the Puerto Rico Freedom of Information Act (Law 141-2019), creating the first set of rules to manage public information and promote transparency in Puerto Rico.

As Ports Authority Director, Anthony spearheaded several major privatization projects including a P3 concession for the Cruise Terminals in San Juan, P3 concession for ferry transportation system and a contract to externalize all operation and maintenance for nine regional airports. In addition, Maceira conducted the five-year compliance audit for the Airport P3 Concession at SJU, managed to close several multimillion development contracts for private investment in public infrastructure and the monetization of unused assets.

Maceira has also served in different government directive and advisory bodies such as: Governor’s Infrastructure Council, Governor’s Disaster Recovery Council, Governor’s Economic Development Council, Maritime Transportation Authority’s Board of Directors and the Puerto Rico Trade and Export Company’s Board of Directors.

Maceira’s experience has allowed him to attend as panelist and spokesperson related to Public Private Partnerships, to various conferences around the globe, including but not limited to: Global Airport Leaders Forum (Dubai-2019); Latin America Airport & Aviation Expansion Summit (Mexico-2018); Latin America Airport & Aviation Expansion Summit (Panamá-2019)The Airport P3 Summit (San Diego, USA- 2018).

Firm Description:

About Us

MZLS LLC is a boutique law firm located in San Juan Puerto Rico, that brings many years of distinguished experience from different backgrounds. Our sophisticated team of attorneys come from different backgrounds including the executive and legislative branches of government, public and private corporations as well as major local law firms. We combine substantive experience and detailed knowledge of Puerto Rico’s tax laws, insurance laws, labor laws, corporate laws, governmental structures and business climate. As well as being a general practice, the firm has wide experience in the design, procurement, negotiation of Public Private Partnership Agreements and other privatization contracts.

Client Focus

We focus on clients from abroad doing business in Puerto Rico, which is a challenging but rewarding US jurisdiction. As our client, you can expect a personal, one-on-one relationship, with a down-to-earth, practical, and integrated approach. Because your success matters to us. Whether through litigation, procurement, contract negotiation or strategic alliance/team building we serve as general outside counsel to cover the core business-related practice areas and public private partnerships.


Cristina Arenas-Solís

Leaders in Law endorses Cristina Arenas-Solís as our exclusively recommended IP Law expert in Puerto Rico. If you wish to get in touch with Cristina please use the contact information provided above.

Cristina Arenas-Solís is a Member of the firm’s Intellectual Property Practice Group. Her principal area of practice is Intellectual Property Law, specifically intellectual property litigation and prosecution.  Cristina provides counseling and advice to clients, focusing her practice on counseling clients in issues and matters regarding trademark protection, prosecution, and registration, as well as the procurement of both local and federal regulations.  In addition, she advises and represents clients in patent litigation nationwide, including the District Courts of Puerto Rico, Eastern Texas, Delaware, Northern California and Utah, and before the Federal Circuit, many of them resulting in favorable settlements for her clients.

Cristina has participated in inter partes review before the Patent Trial and Appeal Board and in Markman hearings before the District Court of Puerto Rico and Eastern Texas. She also has successfully represented clients in trademark disputes before the United States Patent and Trademark Office, Trademark Trial and Appeal Board, the local court in Puerto Rico,  the District Court of Puerto Rico, and the United States Court of Appeals for the First Circuit, obtaining not only damages awards for her clients, but also injunctive relief.

Cristina is fluent in Spanish, English, and French.

Representative Cases or Transactions

  • Federation des Industries de la Perfumerie v. Ebel International Limited, 2007 DTS 212 (Trademark)
  • Compañía de Turismo de Puerto Rico v. Municipio de Vieques, 2010 TSPR 126 (Taxes)
  • Master Lock Company, LLC v. Toledo & Co., Inc., (Civil No. 3:13-cv-01658) D. Puerto Rico (Patent Infringement)
  • Mercado-Salinas v. Bart Enterprises Intern., Ltd., (Civil No. 09-1509) D. Puerto Rico (Trademark)
  • Lamex Foods, Inc. v. Audeliz Lebron Corp., (Civil No. 09-2275) D. Puerto Rico (Act 75 Distribution)
  • Rivera vs. The Coca-Cola Company, et al. (Civil No. 13-1426) D. Puerto Rico (Copyright Infringement)
  • Ingeniador LLC v. Jeffers, Inc., (Civil No. 13-1654) D. Puerto Rico (Patent Infringement)
  • Canatelo, LL v. Bosch Security Systems, Inc.,  (Civil No. 13-1097) D. Puerto Rico (Patent Infringement)

Speaking Engagements

  • Intellectual Property Symposium presented by Ferraiuoli, LLC, 2013 and 2014, La Concha Resort, San Juan, Puerto Rico

José A. Sosa-Lloréns

Leaders in Law endorses José Alberto Sosa-Lloréns as our exclusively recommended Banking and Finance Law expert in Puerto Rico. If you wish to get in touch with José please use the contact information provided above.

José Alberto Sosa-Lloréns has advised clients on banking regulatory matters related to international banking, mergers, corporate reorganizations, securities activities of banks and has served as issuer’s counsel in securities transactions of financial institutions, including tender offers and IPOs. He also has actively worked in the creation of investment companies, investment advisory firms and securities broker dealers in Puerto Rico. Another significant part of his practice includes serving as bond counsel and underwriters counsel in public finance transactions of the Commonwealth of Puerto Rico, its instrumentalities and political subdivisions. He has served as advisor to governmental entities in connection with the enactment of public finance legislation.

José has served as lead local counsel to private consortia bidding for public-private partnerships in various infrastructure projects in Puerto Rico, including representing the successful bidder for the 40-year lease of the Luis Muñoz Marín International Airport, the largest airport in the Caribbean region and the first airport under the Federal Aviation Administration (FAA) Pilot Program.

José has been engaged as counsel in various regulatory matters related to securities broker dealers, investment advisors and investment companies. His practice includes representing clients before the Commissioner of Financial Institutions, the Federal Deposit Insurance Corporation (FDIC), the Board of Governors of the Federal Reserve, the Financial Industry Regulatory Authority (FINRA), the New York Stock Exchange (NYSE), and the Securities and Exchange Commission (SEC), before the Corporate Finance Division. In addition to his regulatory and transactional work, José has represented securities broker dealers in securities arbitrations before FINRA and in complex mediation proceedings.


  • District of Columbia
  • New York
  • Puerto Rico

Prior Experience

Prior to joining DLA Piper, José was the Chair of the Corporate Department of a leading law firm in Puerto Rico where he held various positions, including shareholder, member of the Board of Directors and member of its Executive Committee.


  • José was included in the 2020 Best Lawyers in Latin America and 2021 Best Lawyers in Puerto Rico for Corporate and M&A Law
  • José is ranked as a Leading Individual in the Corporate Commercial field by Chambers & Partners in both its Global and its Latin America Guides


  • LL.M., Columbia University School of Law
  • University of Puerto Rico School of Law, J.D., magna cum laude
  • University of Puerto Rico, B.B.A. (Finance), magna cum laude


  • District of Columbia Court of Appeals
  • Supreme Court of the United States
  • United States District Court for the District of Puerto Rico


  • Puerto Rico Bar Association
  • New York State Bar Association
  • District of Columbia Bar Association
  • American Bar Association, Business Section

Additional Credentials

José is an Adjunct Professor at the University of Puerto Rico School of Law, where he teaches courses and seminars on Banking Regulation and Public Finance.

Firm Description:

DLA Piper is a global law firm with lawyers located in more than 40 countries throughout the Americas, Europe, the Middle East, Africa and Asia Pacific, positioning us to help clients with their legal needs around the world.

We strive to be the leading global business law firm by delivering quality and value to our clients.

We achieve this through practical and innovative legal solutions that help our clients succeed. We deliver consistent services across our platform of practices and sectors in all matters we undertake.

Our clients range from multinational, Global 1000, and Fortune 500 enterprises to emerging companies developing industry-leading technologies. They include more than half of the Fortune 250 and nearly half of the FTSE 350 or their subsidiaries. We also advise governments and public sector bodies.

Responsible Business

Our Global Scholarships programme supports outstanding law students in developing countries reach their potential and contribute to the rule of law in their communities. And our Head Start initiative aims to improve equality of opportunity and break down barriers faced by under-represented groups when entering the legal profession.

Over the course of our six-year partnership with UNICEF, we have pledged $7.5 million through fundraising and pro bono legal support to improve child justice and protect children’s rights worldwide.

We are proud to be signatories of the United Nations Global Compact (UNGC). Our support for the initiative underlines our commitment to responsible business.

DLA Piper strives to be a leader in environmental sustainability, undertaking initiatives to reduce the environmental footprint of its business activities in line with our Global Environmental Policy.

Pro Bono

DLA Piper is deeply committed to pro bono. Our pro bono efforts focus on three areas: the rights of children, access to justice and the rule of law, and assisting asylum seekers, refugees, and stateless people. Our work is both global and local. We provide direct service to individuals and organizations that could not otherwise afford counsel, while helping to build a pro bono culture in the legal profession around the world.

New Perimeter is DLA Piper’s nonprofit affiliate that provides long-term pro bono legal assistance in under-served regions around the world. New Perimeter supports access to justice, social and economic development, sound legal institutions, and women’s advancement. Founded in 2005 as a result of our firm’s commitment to support legal advancement worldwide, New Perimeter’s vision is to harness the skills and talents of DLA Piper lawyers to further a more just world for all.

Diversity and Inclusion

At DLA Piper, diversity, inclusion and equality are a part of how we live our values. We are one of the world’s largest law firms, with lawyers and staff in more than 40 countries throughout the Americas, Europe, the Middle East, Africa and Asia Pacific. Our people reflect the diversity of our clients and the many communities and markets where we work.

With offices worldwide, our efforts to understand, value and incorporate differences are woven into our culture. We are on a journey and, like most law firms, we still have some distance to travel. But with strategic approaches within our geographic regions, we’re making great progress. Visit our diversity and inclusion pages to learn more.

María Cristina de la Vega

Leaders in Law endorses María Cristina de la Vega as our exclusively recommended Environmental Law expert in Puerto Rico. If you wish to get in touch with Maria please use the contact information provided above.

Maria Cristina de la Vega is an associate in the Corporate Department. She joined O’Neill & Borges in 2018. María Cristina’s practice is focused on Environmental Law, Energy Law and Zoning and Land Use Law.  Prior  to joining the firm, she worked in the Litigation Department of another major law firm in Puerto Rico.


  • University of Puerto Rico, B.A. in Sociology with an emphasis in Criminology, 2013
  • University of Puerto Rico School of Law, J.D., 2016
  • Vermont Law School, Master of Environmental Law & Policy, 2017

Bar Admissions

  • Puerto Rico (2017)

Firm Description:

O’Neill & Borges LLC is a full-service law firm established in 1962, and located in San Juan, Puerto Rico. Our attorneys adhere to the highest standards of legal excellence and service.  O’Neill & Borges has a long-standing history of being involved in many of the most significant corporate transactions and adversarial proceedings in Puerto Rico.

For over 10 years, O’Neill & Borges has been recognized by the prestigious Chamber and Partner’s rankings and publications, based in London, U.K., as one of the leading firms in Puerto Rico. In 2011 and 2014, O’Neill & Borges received the highest distinction from this institution becoming the first law firm in Puerto Rico to be awarded the “Law Firm of the Year” award. Many of our attorneys are listed as “Leaders in Their Field” in the Chambers Latin America and Global guide.  Our team includes an experienced group of paralegals, legal assistants and other staff members dedicated to serving our clients.

We foster an integrated, collegial atmosphere, encouraging collaboration to ensure well-rounded and thorough legal advice and representation.

Our client base is extensive and representative of the major economic sectors of the Puerto Rican economy. Among our clients are leading business organizations, including Fortune 500 companies.


Kenneth Suria

Kenneth C. Suria is Estrella, LLC’s Director of Federal Practice.  He joined Estrella, LLC in March 2000, and focuses his trial practice on commercial litigation, trademark protection, bankruptcy, petroleum franchising and personal injury.  He is admitted to practice in all the state and federal courts of Puerto Rico and New York, as well as the U.S. Courts of Appeal for the First and Second Circuits.

Mr. Suria graduated from Spring Hill College in Mobile, Alabama in 1979.  He received his law degree from New York Law School in 1983.  He is a member of the National Institute for Trial Advocacy where he became the first NITA Certified Faculty Member in Puerto Rico.  This led to his being named the first Puerto Rico Program Director for NITA’s renowned Trial Skills Program.  Mr. Suria is also an active member of the Federal Bar Association-Puerto Rico.

In 1985, he commenced his legal career with Hartford Fire & Indemnity Insurance Company representing the carrier’s assureds in general liability and automobile insurance claims in cases from their inception through trial. Two years later he became staff counsel for CIGNA Property & Casualty Company where he represented the company’s assureds in a vast array of areas of civil litigation, including premises liability, automobile accidents, general liability, insurance law, products liability, copyrights, appeals and federal litigation.

His experience led him to try numerous cases from inception through verdict in New York and in Puerto Rico involving general liability cases that include premises liability, automobile accidents, insurance law, products liability, intellectual property, P.M.P.A. and federal litigation.  This led to being recognized as one of the Global Law Experts in the area of Civil Litigation for Puerto Rico.

Mr. Suria has authored several articles that have been published in NITA’s International Blog, the U.S. Virgin Islands Bar Association Newsletter and in our Firm’s Newsletter – Legal Tidbits, among others.

Estrella, LLC, a full-service Puerto Rico litigation firm, boasts first-rate trial lawyers who provide rigorous legal representation to a diverse group of blue-chip clients. With a sophisticated legal practice, Estrella, LLC attracts clients from all over the world. Many of our international clients are in demanding and highly competitive industries, including oil and gas companies, retail chains and manufacturers. As a results-oriented Puerto Rico litigation firm, we focus on providing aggressive and effective advocacy for our clients so that we can attain the best possible outcome for their business. Our firm attracts attorneys with a broad variety of backgrounds and experiences. This diversity of backgrounds produces creative solutions to complex legal problems.

Education: New York Law School/J.D./1983 – Spring Hill College/B.S./1979

Professional Affiliations: American Bar Association – Puerto Rico Bar Association – Federal Bar Association

Professional & Community Involvement: Estrella Trial Advocacy Competition; Judge (George Washington Law School) – Rotary Club/2011-Present – Bayamon Soccer Club/Member/2013-Present – Club Volleyball Vaqueros de Bayamon/Vice-president/2008-2011 – Van Scoy Basketball Club/Vice-president/2004-2006