2008 he was elected member of the Junge Kurie of the Austrian Academy of Sciences[1] ÖAW.

Rupnow taught as a visiting assistant professor in the Jewish studies program at Dartmouth College, at the University of Bielefeld and was invited for fellowships at the history department of Duke University, the Simon Dubnow Institute for Jewish History and Culture at Leipzig University[2] and the Center for Advanced Holocaust Studies at the United States Holocaust Memorial Museum[3] in Washington, DC.

For his work Rupnow received numerous international awards, e.g. 2009 the Fraenkel Prize in Contemporary History of the Wiener Library,[4] London, and 2011 the „Humanities International“ award of the German Publishers and Booksellers Association.

[5] Junge Kurie, Austrian Academy of Sciences ÖAW (elected 2008), American Historical Association AHA (since 2003), German Studies Association GSA (since 2003), Austrian Scientists and Scholars in North America ASCINA[6] (since 2004), Society for History of Science GWG[7] (elected 2007).

Since 2017, he is also member of the International Academic Advisory Board of the Vienna Wiesenthal Institute for Holocaust Studies VWI.