He has published research on a wide variety of subjects related to the history of the Catholic Church from the Middle Ages to the 19th-20th centuries.
He worked as academic assistant at the journal Archivum Historiae Pontificiae, as an official of the Congregation for the Doctrine of the Faith, and as archivist of the Tribunal of the Apostolic Penitentiary.
[1] On 26 June 2008, while working at the Penitentiary, he was appointed to a five-year term as a consultor to the Congregation for the Causes of Saints.
[3] He is the author of a study of the Holy See's assessment of Germany's tactics in occupied Belgium during the First World War, La Guerre et le Vatican (2018).
He argued that Eugenio Pacelli, the future Pope Pius XII who was then secretary of the Department of Extraordinary Ecclesiastical Affairs played a key role in bringing the Vatican to discount German propaganda and recognize Germany was trying "to terrorize the population" of Belgium.