Carlos A. Aldarondo-López

Mr. Méndez-Benabe chairs McConnell Valdés' Corporate Practice Group. His practice focuses on corporate and financing transactions, including mergers and acquisitions, commercial financing and public finance. He also has extensive experience with public private partnerships and financial institutions regulations. Over the years, he has advised banks, broker-dealers, and other financial institutions on corporate (including mergers & acquisitions) matters, the structuring and n...

Katherine González-Valentín is a lawyer recognized by Best Lawyers in the practice areas of Labor and Employment Law and Litigation. Katherine practices law in San Juan, Puerto Rico Best Lawyers has recognized Katherine González-Valentín since 2017. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Katherine González-Valentín is held by other lawyers.

Mr. García-Díaz has over 20 years of experience in the private practice, providing counseling to clients in regulatory and compliance matters related to major federal and local environmental laws, such as CERCLA (Superfund), RCRA, Clean Air Act, Clean Water Act and the Oil Pollution Act. He represents clients before local and federal agencies with jurisdiction over Puerto Rico environmental matters, such as the United States Environmental Protection Agency, the United States Arm...

Mr. Juan J. Casillas-Ayala, Esq. is an Attorney at Casillas, Santiago & Torres, LLC, where he specializes in Labor & Employment and Commercial Litigation. He was a shareholder in the Labor and Employment division of a major law firm in Puerto Rico, where he further sharpened his litigation skills during his 11 years tenure at the firm. Prior to this, he served as law clerk at the Court of Appeals with now Supreme Court Justice Rafael Martínez-Torres and subsequently at the Supreme Co...

Mr. Mayoral acts as lead counsel in a wide range of banking, securities, and insurance acquisitions, and on regulatory applications to federal and Puerto Rico banking agencies. His practice is concentrated in banking, financial, and insurance regulatory matters, as an advisor for banks and other financial institutions (including international banking entities doing business in Puerto Rico), and insurance companies and producers. He has also acted as lead counsel in a wide range of corporate t...

Idalmarie Lopez is a lawyer recognized by Best Lawyers in the practice area of Corporate Governance & Compliance Practice. Idalmarie practices law in San Juan, Puerto Rico Best Lawyers has recognized Idalmarie Lopez since 2026. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Idalmarie Lopez is held by other lawyers.

Mr. Rodríguez, who joined the Firm in 1974, practices in the areas of tax exemption, general corporate and government contracts. He has negotiated and re-negotiated dozens of grants of tax exemption for companies owned by U.S., European and Puerto Rican entities, including Johnson & Johnson, Schering-Plough, Medtronic, Harvey Hubbell, Astra-Zeneca (U.K.), Aventis (France) and MOVA (Puerto Rico).

Her main areas of practice are tax incentives, employee benefits, corporate and individual income taxes. Prior to joining McConnell Valdés, Ms. González-Ibarría was a Legal Counsel with the Internal Revenue Area of the Puerto Rico Treasury Department. While with the Puerto Rico Treasury Department, she reviewed closing agreements and private letter rulings concerning a broad range of issues including general income taxation, withholding, corporate reorganizations and empl...

María Judith (Nani) Marchand-Sánchez is a Capital Member and one of the founders of Ferraiuoli LLC and has vast experience in employment matters. She has successfully litigated before the Courts of First Instance of Puerto Rico and in the Federal Court, as well as government agencies and administrative forums, including participation in mediation and arbitration proceedings. Ms. Marchand has solid experience litigating disputes in areas such as discrimination, harassment, retali...

Rosa M. González-Lugo is a lawyer recognized by Best Lawyers in the practice areas of Corporate and M&A Law, Employee Benefits Law and Tax Law. Rosa M. practices law in San Juan, Puerto Rico Best Lawyers has recognized Rosa M. González-Lugo since 2015. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Rosa M. González-Lugo is held by other lawyers.