His doctoral thesis, supervised by Gabriele Thome, was entitled 'Carmina Saturnia Epigraphica: Einleitung, Text und Kommentar zu den saturnischen Versinschriften' (Carmina Saturnia Epigraphica: Introduction, Text and Commentary on the Saturnian verse inscriptions).
Already during his doctoral studies Kruschwitz began to work as a member of research staff of the Corpus Inscriptionum Latinarum at the Berlin-Brandenburg Academy of Sciences and Humanities.
In 2005, Kruschwitz was awarded a two-year Emmy Noether postdoctoral fellowship of the Deutsche Forschungsgemeinschaft which he spent at the University of Oxford.
[2] Kruschwitz is academician of the Pontifical Academy for Latin[3] and a full member of the Academia Europaea.
[4] In 2019, Kruschwitz was awarded a European Research Council Advanced Grant for a project on 'Mapping out the poetic landscape(s) of the Roman empire'.