José Manuel Díaz Martín holds a degree in Law (Alicante and Bologna), a diploma in Political Science and Constitutional Law (CEPC, Madrid) and a PhD in Philosophy (Balearic Islands). He works as a bibliographer in charge of the early holdings of the Biblioteca Diocesana in Mallorca. After a period teaching constitutional law, he is currently devoted to independent research. His publications focus on the theology of the Augustinians and Christians of Jewish origin in Spain (15th–17th centuries), and on the integration of Spanish thought into the European context of the 18th century. He is the author of La responsabilidad política en los sistemas democráticos [Political Responsibility in Democratic Systems] (2001) and Leyendo a fray Luis de León [Reading Fray Luis de León]