Krebs' principal research interests are Greek and Roman Historiography, Latin Lexicography and the Classical tradition.
While Assistant Professor at Harvard, he was Professeur Invité at the École Normale Supérieure in Paris in 2007 and the APA fellow at the Thesaurus Linguae Latinae in Munich in 2008/09.
[5] In addition, he is co-editor of Time and Narrative in Ancient Historiography: The ‘Plupast’ from Herodotus to Appian, published in 2012,[6] a contributor to the Thesaurus Linguae Latinae and Der Neue Pauly, and the author of over 20 journal articles.
He is currently working on a variety of projects which include studies of Caesar, Latin Historiography, Posidonius and Annio di Viterbo.
He has also taught the Stanford Humanities Institute summer course on Rome, which discusses renowned Roman leaders and orators such as Tacitus.