[citation needed] He has a Doctor of Constitutional Law degree from the University of Regensburg (Germany),[1] In 1989 he joined the Chair of Public Law at the University of Regensburg as scientific assistant to Professor Rainer Arnold, who would be his thesis advisor.

After finishing his doctoral studies in Germany, he moved to Madrid in 1993, linking his academic career to the Spanish experts in constitutional law, Antonio Torres del Moral,[3] and Manuel Aragón Reyes.

As an expert lawyer in freedom of expression, he was active in the defense of the media and journalists (Grupo Prisa, ABC, El Español, Asociación de Editores...).

Cremades also advised international companies in the telecommunications sector when Spain liberalized its stock market.

Among the publications with several authors stand out: E-lawyer with Enric Badia (La Ley-Actualidad, 2007); Régimen jurídico de internet (Wolters Kluwer 2001), developed with Miguel Fernández Ordoñez and Rafael Illescas and El planeta internet (Arguval, 2002) with Marian Carnicer and Santiago Rodríguez Bajón.