The first recorded head librarian

The first recorded head librarian was Zenodotus of Ephesus. Zenodotus's main work was devoted to the establishment of canonical texts for the Homeric poems and the early Greek lyric poets. Most of what is known about him come from later commentaries that mention his preferred readings of particular passages. Zenodotus is known to have written a glossary of rare and unusual words, which was organized in alphabetical order, making him the first person known to have employed alphabetical order as a method of organization.