Genesis ~ Moses
Exodus ~ Moses
Leviticus ~ Moses
Numbers ~ Moses
Deuteronomy ~ Moses
Joshua ~ Joshua
Judges ~ Samuel
Ruth ~ Samuel
1 Samuel ~ Samuel
2 Samuel ~ Samuel
1 Kings ~ Jeremiah
2 Kings ~ Jeremiah
1 Chronicles ~ Ezra
2 Chronicles ~ Ezra
Ezra ~ Ezra
Nehemiah ~ Ezra
Esther ~ Mordecai
Job ~ Moses
Psalms ~ (Mostly David)
Proverbs ~ Solomon
Ecclesiastes ~ Solomon
Song of Solomon ~ Solomon
Isaiah ~ Isaiah
Jeremiah ~ Jeremiah
Lamentations ~ Jeremiah
Ezekiel ~ Ezekiel
Daniel ~ Daniel
Hosea ~ Hosea
Joel ~ Joel
Amos ~ Amos
Obadiah ~ Obadiah
Jonah ~ Jonah
Micah ~ Micah
Nahum ~ Nahum
Habakkuk ~ Habakkuk
Zephaniah ~ Zephaniah
Haggai ~ Haggai
Zechariah ~ Zechariah
Malachi ~ Malachi
Actually in the Bible study that I was in, the historian said that Isaiah was probably written by three different people. Change in style.