Anthony O. Maceira Zayas joins Leaders in Law as the exclusive Commercial Law member in Puerto Rico

Leaders in Law, the leading platform in its field, is delighted to welcome Anthony O. Maceira Zayas as our exclusively recommended & endorsed Corporate Law expert in Puerto Rico. Anthony’s office is located in San Juan.

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.

If you require any assistance in this area, please use the contact details provided in Anthony’s profile below or contact us at & we will put you in touch.

O’Neill & Borges Puerto Rico Overview 2021 for Chambers Global

O’Neill & Borges LLC asked to author an In-Depth Overview of Puerto Rico for 2021 featured in the prestigious Chambers Global 2021 Guide. The article provides an interesting fiscal, legal and economic outlook for Puerto Rico entering 2021.


O&B also authored the Chambers Puerto Rico Corporate Tax Guide (2019) for the Global Practice Guide published by Chambers & Partners.