Alexandra Rengel, LLM/JSD is one of the founding members of Mercado & Rengel. Attorney Rengel is an experienced trial and appellate lawyer in both federal and state courts. Her vast trial experience includes cases of great complexity, ranging from multi-defendant fraud and narcotics importation cases to murder in the first degree. Additionally, she has filed numerous appellate briefs and argued before the Appeals Court in Florida, the Massachusetts Supreme Judicial Court and the Eleventh Circuit Court of Appeals.

Court Admissions

Attorney Rengel is a member of the Florida and Massachusetts Bars and is admitted to practice before the United States District Courts of Massachusetts, the Southern and Middle District of Florida, Washington D.C., New Jersey, and the United States Court of Appeals for the Eleventh and First Circuits.  She has also handled cases pro hac vice before the United States District Courts of  New Hampshire, Puerto Rico, Rhode Island, Maine, Connecticut and New York. Outside of the United States, Ms. Rengel is admitted to practice law in Spain by the Ilustre Colegio de Abogados of Madrid, Spain, and has litigated cases in the province of Madrid.

Professional Associations

Attorney Rengel is a member of the National Association of Criminal Defense Lawyers; the Massachusetts Association of Criminal Defense Lawyers and the Women’s Bar Association of Massachusetts.

Since 2012, Attorney Rengel has been on the Board of Directors of Fundación Maria Madrid, an NGO in Andalusia, Spain, dedicated to helping children and families at risk of social exclusion.


Attorney Rengel obtained her Bachelor’s Degree (B.A) from Mount Holyoke College in South Hadley, Massachusetts; and her Juris Doctorate (J.D.) from Boston University, in Boston, Massachusetts. She holds a Master’s in Spanish Law from the Universidad de Alcalá de Henares (LL.M.) and a Master’s of law in Intercultural Human Rights (LL.M.) from Saint Thomas University School of Law in Miami, Florida. Additionally, in 2013, she obtained a Doctorate of Juridical Science Degree (J.S.D.) from St. Thomas University School of Law in Miami, Florida; having obtained the highest grade of summa cum laude for her Doctoral Dissertation on the subject of privacy.


Alexandra Rengel is a frequent lecturer on privacy and other legal issues. One of her most memorable presentations took place at the headquarters of the European Parliament in Madrid in 2013, at an event organized by the International NGO Helsinki, regarding the treatment of the death penalty in the United States.

Dr. Rengel has taught at the Madrid Campus of Suffolk University as well as the M.B.A. programs of Schiller International University and Comillas Pontifical University in Madrid, Spain. Currently, Dr. Rengel teaches at the Master Program in International Law and Business at Instituto de Empresa in Madrid.

Occasionally, Dr. Rengel imparts seminars on International Business Law and Transnational Dispute Resolution. She has lectured at the University of Toulouse, in France, and at the Ilustre Colegio de Abogados de Zaragoza, in Zaragoza, Spain.


  • Privacy in the 21st Century, (Martinus Nijhoff Publishers, 2013);
  • Chapter author in Inside the Minds: Understanding International Criminal Law, “The Origins and Evolution of International Criminal Law” (Thompson Reuters / Aspatore Books, 2014).

She is has also authored the following articles:

  • Privacy as an International Human Right and the Right to Obscurity in Cyberspace, GRONINGEN JOURNAL OF INTERNATIONAL LAW, vol. 2, ed. 1 (Nov. 2014).
  • Privacy-Invading Technologies and Recommendations for Designing a Better Future for Privacy, 8 INTERCULTURAL HUM. RTS. L. REV., 177 (2013);
  • Book Review, El Derecho en Español: Terminologia y Habilidades Juridicas Para Un Ejercicio Legal Exitoso, Katia Fach Gómez, University of Texas Press, May 2014, review available at: American Bar Association, International Law News, Fall 2014.