Albert Barnes Commentary Nehemiah 11:24

"And Pethahiah the son of Meshezabel, of the children of Zerah the son of Judah, was at the king`s hand in all matters concerning the people." — Nehemiah 11:24 (ASV)

It is difficult to say what office Pethahiah filled. So far as we know, the only regular officers under the Persian system of government were the satrap, the subsatrap, the permanent royal secretary, the commandant, and the occasional commissary.