Recognized in Best Lawyers since 2027 
Mariola’s practice focuses on federal litigation and appellate matters involving regulatory enforcement, administrative law, and compliance disputes. Based in San Juan, she advises public and private clients on federal oversight, healthcare, energy, and economic-development matters, including issues arising at the intersection of local and federal regulatory frameworks.
Her work includes developing litigation strategy, drafting dispositive and appellate briefs, managing discovery, and negotiating settlements in complex proceedings. Mariola also represents clients in federal appeals and commercial disputes before the U.S. District Court and the U.S. Courts of Appeals for the First and Second Circuits.
Before joining MZLS LLC, Mariola served as Assistant Solicitor General of Puerto Rico, where she represented the Commonwealth and its instrumentalities in federal-court litigation and appeals. Among her matters, she was part of the legal team that defended Puerto Rico in Clemente v. Puerto Rico, 1st Cir. No. 23-1922, involving Lanham Act and Takings Clause issues arising from official government programs and the Roberto Clemente commemorative program.
Earlier in her career, Mariola practiced with Pietrantoni Méndez & Álvarez LLC and Adsuar Muñiz Goyco Seda & Pérez-Ochoa, PSC, handling commercial disputes, securities arbitration, and compliance-related litigation before federal and territorial courts. She also clerked for Chief Judge Dora L. Irizarry of the U.S. District Court for the Eastern District of New York, assisting with judicial opinions and analyzing regulatory enforcement matters.
Practice Area: Appellate Practice
Representative Experience
- Represents private and public clients in federal litigation and appeals involving regulatory enforcement, administrative compliance, and complex commercial disputes.
- Defended the Commonwealth of Puerto Rico in Clemente v. Puerto Rico, 1st Cir. No. 23-1922, addressing Lanham Act and Takings Clause claims related to the Roberto Clemente commemorative program.
- Advises on federal-compliance litigation involving healthcare, energy, and economic-development matters.
- Managed multiparty arbitration and mediation proceedings before FINRA and the American Arbitration Association.
- Drafted and argued dispositive motions in the U.S. District Court and appellate briefs in First and Second Circuit matters.
