1996–1997), Kanadski životopis Gojka Šuška (A Canadian Biography of Gojko Šušak, 1999–2000), Trinaest stoljeća kršćanstva u Hrvata (Thirteen Centuries of Christianity amongst Croatians, 2008), etc. At the end of 1995, he wrote a lengthy Izvještaj o hrvatskoj estradi (A Report on Croatia's Pop Music) for Globus in the form of two separate texts. From 1996, he spent several years studying the life story of Croatia's first President Franjo Tuđman. This led to the publishing of his book Tuđman: biografija (Tuđman: Biography) in 2004, which the Jutarnji List in early 2005 proclaimed the best book of the year in the field of journalism. After that book, Darko Hudelist began his extensive research of the history of Croatian-Serbian relations and conflicts in the 20th century. In May 2006, he established a research office in Belgrade where he resided until June 2011. During that time, he carried out archival research (in all of Belgrade's historical archives, from the Yugoslavian Archive to the Archive of the Serbian Academy of Sciences and Art) and he spoke with numerous witnesses of contemporary history. The most notable amongst these witnesses was the father of modern Serbian nationalism Dobrica Ćosić. In his book Moj beogradski dnevnik: Susreti i razgovori s Dobricom Ćosićem 2006.-2011. (My Belgrade Journal: Meetings and conversations with Dobrica Ćosić 2006–2011), published in July 2012, Hudelist immortalized the period he spent in Belgrade. In parallel to conducting his research in Belgrade, Hudelist was also researching in Zagreb where he especially focused on the political activities of the Croatian Catholic church in Yugoslavia – with an emphasis on the 1970s and 1980s during which time the church's large project Trinaest stoljeća kršćanstva u Hrvata (Thirteen centuries of Christianity in Croatia, 1975–1984)., In 2013, Darko Hudelist completed the research he carried out for multiple years and he turned to writing new books. He announced the release of an entire library of books that would carry the title Dvadeseto stoljeće (The Twentieth Century) and which would be composed of several individual books, each of which would be dedicated to a particular topic. The first book would deal with the church (both within the context of the world and domestically, with an emphasis on the Croatian Catholic church's Jubilee cycle Thirteen centuries of Christianity in Croatia (Thirteen centuries of Christianity amongst Croatians). while the second book would be about Croatian-Serbian relations and conflicts (including the war and breakup of SFR