Professor Frost’s research interests lie in the history of eastern Europe from the fourteenth to the ninteenth centuries; the history of Scandinavia, in particular the history of Sweden, and in the history of warfare.
He has held the Burnett Fletcher Chair of History at Aberdeen since 2013. In 2009 he was awarded a three-year Research Chair by the British Academy and the Wolfson Foundation for his history of the Polish-Lithuanian union, volume one of which, The Making of the Polish-Lithuanian Union, 1385–1569 was published by Oxford University Press in June 2015. In 2017 the book was awarded the Pro Historia Polonorum prize. Professor Frost was also awarded the Union of Lublin medal by the city of Lublin for ‘significant contributions to the preservation of the memory of the Union of Lublin.’ He received a three-year major Leverhulme Fellowship in 2016 to write volume two of his study.