[5] Fusi, currently Professor of History at Universidad Complutense de Madrid, where he has held the Chair of Contemporary History since 1988, has devoted a large part of his career teaching at universities in Spain, the United Kingdom and the United States.
He has been a lecturer at Colegio Universitario San Pablo-CEU and professor at universities in Murcia, Cantabria and the Basque Country.
Between 1986 and 1990, Fusi was the Director of the Biblioteca Nacional de España,[4] and is still a member of its board of trustees.
Fusi was elected to medalla nº 15 of the Real Academia de la Historia on 21 November 2014.
Comprising, among others, Federico Mayor Zaragoza and Columbia University Professor of History Edward Malefakis, the committee declared in 2004, by a majority of 14 of its 17 members, that it was "just and legitimate" that the documents be returned to the autonomous government.