The thesis Ensayo sobre el voluntarismo de J. Duns Scoto gave him a Doctorate in Philosophy at the University of Madrid.
He taught both at secondary schools and at the University of Barcelona from 1939 to 1964, first as a teaching assistant and, for the last twelve years, as professor.
These form part of the work of Historia de la filosofia española: filosofia cristiana de los siglos XIII al XV (published between 1934 and 1943), which he wrote in collaboration with his brother Tomàs Carreras i Artau, who was a philosopher and professor of Ethics.
He was a member of the Science Section of the Institut d’Estudis Catalans (1944) and the Reial Academia de Bones Lletres of Barcelona (1955), Chairman of the Société Internationale pour l'Étude de la Philosophie Médiévale (1964) and teacher of the Escola Lul.lística of Mallorca.
Other work includes La filosofía universitaria en Catalunya durante el segundo tercio del s. XIX (1964) and a great number of studies on Arnau de Vilanova, along with critical editions of his spiritual works.