He was offered an External Senior Fellowship at the School of History of the Freiburg Institute for Advanced Studies (FRIAS) from October 2009 to September 2010 to develop a new research on the "Fringes of Europe" in a comparative perspective from the 18th to the 20th century.
He has mainly written on Spanish Modern history, for instance Spanish foreign policy during the Second Republic and the Spanish Civil War (1931-1939) with regard to the great powers and the Spanish Republican exile in France after 1936-1939, but he also published articles about Scandinavian modern history.