Marvin has over 20 years of experience in the study and practice of public law, although he has also worked in the fields of criminal law and real estate. He was a clerk of the Constitutional Chamber of the Supreme Court of Costa Rica, Director of the Judicial Training School, and for nearly five years, General Legal Counsel of the Presidency of Costa Rica. In this role, it was providing specialized advice to various public institutions, as well as to mediate in conflicts with actors from the private Sector.
He was agent of the State of Costa Rica before the Inter-American Court of Human Rights. Stands out, among others, his participation in the inquiry that led to the Court issued the Advisory Opinion OC/24, about the rights of LGBTI people in the entire American continent.
Marvin has brought important judgments before the Constitutional Court and has accompanied various cases of administrative Law, arbitration, and administrative procedures. He has participated in the preparation of several bills and executive regulations.
He is Professor of constitutional law at the University of Costa Rica since 1998. He has served as a postgraduate teacher in universities in Costa Rica, the Dominican Republic and Nicaragua. He has been a visiting professor at Columbia University, the University of São Paulo, Brazil, at Duquesne University and in the University of Buenos Aires, Argentina. It has been facilitator in processes of judicial training for judges and candidates from various countries.
He was Director of the Institute of the press and freedom of expression (IPLEX), is a founding member of the Costa Rican Institute of constitutional law and is a member of the Justice Advisory Council the report of the State of the nation.
Law Degree from the University of Costa Rica (1994).
Doctorate in Constitutional Law from the University of São Paulo, Brazil (2000), Specialization in Administrative Law frotm the University of Salamanca, Spain (2002).
Postgraduate in Human Rights from the University of Chile (2010).