Ziolkowski's books include critical editions and translations of medieval Latin texts, such as Jezebel: A Norman Latin Poem of the Early Eleventh Century, as well as wide-ranging studies in literary and intellectual history, such as Fairy Tales from Before Fairy Tales: The Medieval Latin Past of Wonderful Lies.
Ziolkowski is general editor of the Dumbarton Oaks Medieval Library, a book series that he initiated,[REF] which presents medieval primary texts in Latin, Greek, and Old English along with facing-page translations.