as a renowned historian with internationally acclaimed and cited works, Lacko has been considered controversial since 2014 due to his historical revisionist positions and his open support for the far-right ĽSNS party.
Lacko worked as a member of the scientific research section of the National Memory Institute in Bratislava.
He specializes in Slovak history during the Second World War and has published over 30 academic studies on this topic in Slovakia and abroad.
In 2002–2004, he organised the conference Slovenská republika 1939-1945 očami mladých historikov (The Slovak Republic 1939–1945 in the Eyes of Young Historians) three times.
In his essay (2011) on the Slovakian resistance against the Tiso regime, Zückert categorises Lacko's work among those accounts that ‘critically assess the role of the partisans and the Soviet Union’ and have recently caused controversy in Slovakia.