Gregor Jenuš graduated and received his PhD from the Department of History at the Faculty of Arts, University of Maribor, where he continued to work as a research assistant between 2006 and 2011. In 2011, he landed a job at the Archives of the Republic of Slovenia. After passing archival professional exam, he oversaw archival records of the former Republic Secretariat of the Interior of the Socialist Republic of Slovenia and those of the Ministry of the Interior of the Republic of Slovenia. Since June 1, 2023, he has been serving as the Deputy Director of the Archives of the Republic of Slovenia.

The main areas of his professional work focus are digitalization of public archives services, digitization of archival records and personal data protection. He is a member of the e-ARH.si, E-ARK and InterPARES AI Trust project groups involved in the management of digital archival records. He is also the Slovenian representative in the European Network of Official Authorities in Charge of Secret Police Files. Between 2022 and 2023 he was a member of the council of the National Museum of Slovenia.

He is active in Slovenian professional organizations and associations; he was the editor-in-chief of the archival journal Arhivi published by the Slovenian Archival Association (2016-2019), and a member of its executive committee (2015-2023); he served two terms as a member of the executive committee of the Historical Association of Slovenia and as the president of its Section for cooperation with archives (2020-2022, 2022-2024); he was the secretary of the Historical Society dr. Franc Kovačič (2007-2014) and a member of its executive committee. He is currently a member of the editorial boards for the journals Arhivi (2024-), Moderna arhivistika: časopis arhivske teorije in prakse /Journal of Archival Theory and Practice (2021-), and Studia Historica Slovenica: Humanities and Social Studies Review (2020-).

As a historian, he is interested primarily in the study of the national relations in the Habsburg Monarchy and the Kingdom of Yugoslavia in the 19th and 20th centuries, as well as in the research of the development of minorities and violation of human and minority rights. Between 2021 and 2022 he was a member of the project conducted by the Slovenian Research and Innovation Agency titled “Analysis of the situation of the Croatian, German and Serbian communities in the Republic of Slovenia« (from October 1, 2021 to September, 30, 2022, no. V5-2017), where his research was directed at legal and historical aspects of minority protection in Slovenia, focusing on the example of the German ethnic community.  Between 2011 and 2023, he worked first as an assistant and later as an assistant professor lecturing on European and non-European contemporary and modern history at the Faculty of Arts of the University of Maribor and on European contemporary history at the School of Humanities of the University in Nova Gorica.