The book was written by Baruch, Jeremiah’s disciple and secretary (the scribe who recorded Jeremiah’s prophetic words at his request (Jer. 36:4-8) and wrote them down again after King Jehoiakim burned them, around 605 BC). Later Baruch fled to Egypt with Jeremiah (Jer. 43:1-7). It is believed that after Jeremiah’s death, Baruch ended up in Babylon where the Jews were in exile.

The Greek translation may have been written in 116 BC, when the grandson of Ben Sira translated the books of the law and the prophets (Prologue to Sirach).