Author of the Book of Isaiah

Author - Isaiah (According to the Bible, Jesus, and Jewish Tradition). There was only one Isaiah according to the Hebrew Scriptures. There is little information about the personal life of the Prophet Isaiah. He was married to a woman called the prophetess (Isaiah 8:3), she bore him two sons (Isaiah 7:3 and Isaiah 8:3). According to Jewish tradition Isaiah was martyred by the wicked King Manasseh who placed him in the hollow trunk of a carob tree and was sawn in two. many believe also that it was Isaiah who was referred to in the book of Hebrews in the New Testament regarding a hero of faith "sawn asunder" (Hebrews 11:37).

Link: https://bible-history.com/old-testament/bookofisaiah