My work in Hebrew bibliography and manuscript studies addresses how texts acquire—and sometimes lose—attributional stability through transmission, editorial intervention, and scholarly reception. I focus on competing versions, disputed authorship, and the mechanisms that produce bibliographic confusion, especially where polemics, intellectual prestige, or scholarly agendas shape what later readers accept as “the” text. This research is grounded in manuscript-based philology and the history of scholarship, combining close reading with attention to the material record of copying, compilation, and revision.

A central anchor for this agenda is my study of Ibn Ezra’s Iggeret ha-Shabbat (“Authors, Targets and Versions of Ibn Ezra’s Iggeret ha-Shabbat; A Polemic against Calendrical Heresies”). In parallel to peer-reviewed work, I develop Jewish bibliographic, textual, and historical studies for a broader readership in a series of posts on the Seforim Blog (tag page):
https://seforimblog.com/tag/leor-jacobi/