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Moses -

The man who led the Israelites out from slavery in Egypt penned about 20% of the Bible. These include the books of Genesis, Exodus, Leviticus, Numbers, Deuteronomy, and also Psalm 90.

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Ezra -

Similar to Moses, Ezra led the Israelites from exile back into the Promised Land. He authored 1 and 2 Chronicles, as well as the Book of Ezra (in the Hebrew Bible).

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Nehemiah -

The governor of Persian Judea, who helped rebuild Jerusalem during the Second Temple period, wrote the Book of Nehemiah in the first person.

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David -

The shepherd boy who killed Goliath and later became king of Israel is an important biblical character. David wrote about half of the Book of Psalms.

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Solomon -

According to 1 Kings 4:32, King Solomon spoke 3,000 proverbs and wrote 1,005 songs. Solomon is credited as the main author of the Book of Proverbs and also wrote the books of Ecclesiastes and Song of Solomon. Like his father, King David, he also penned a couple of Psalms: numbers 72 and 127, to be more precise.

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Asaph -

Asaph, a singer from the tribe of Levi, and his family were appointed by David as the worship family of the temple. Asaph is the author of Psalms 50 and 73 to 83.

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Sons of Korah -

Korah challenged Moses when he lead the Israelites through the wilderness, and died as a punishment from God. His sons, however, survived, and went on to write 11 Psalms (Psalm 42, 44–49, 84–85, and 87-88).

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Heman -

Heman the Ezrahite was a wise man, who, together with the sons of Korah, wrote Psalm 88.

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Ethan -

Ethan was also a wise man. He, too, left his mark on the Bible, as the author of Psalm 89.

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Agur -

Agur is a rather obscure biblical character. Not much is known about him, but his writings can be found in Proverbs 30.

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Lemuel -

The Bible doesn’t say a lot about Lemuel, other than the fact that he was a king. Proverbs 31 includes advice from Lemuel's mother, which is a pretty unique angle in the Bible.

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Isaiah -

Isaiah is one of the major prophets in the Bible. He penned the Book of Isaiah, though his disciples may have actually written part of it.

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Jeremiah -

The famous prophet wrote both the Book of Jeremiah and the Book of Lamentations, where he mourns the fall of Jerusalem.

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Ezekiel -

Prophet Ezekiel’s life as a Jew during the Babylonian captivity wasn’t easy, but he did become known for his prophecies and managed to author the Book of Ezekiel.

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Daniel -

Daniel was a wise man and an important biblical figure who prophesied about the future of the world’s kingdoms, the Messiah, and God’s plan. He wrote the Book of Daniel.

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Hosea -

Hosea was a prophet who married a harlot under God’s instructions. The relationship with an unfaithful woman mirrored that of Israel, because they worshiped other gods. He wrote the Book of Hosea.

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Joel -

All we know about Joel is that he is a prophet and the son of Pethuel. He penned the prophetic Book of Joel.

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Amos -

The shepherd from the Southern Kingdom of Judah was told by God to prophesy against the king of Israel. You can find the Book of Amos in the Old Testament.

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Obadiah -

Obadiah is known for his prophecy against Edom, but that’s as much as we know about him. The words of this biblical prophet can be found in the Book of Obadiah.

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Jonah -

Prophet Jonah is known for spending three days in the belly of a large sea creature. He’s the main character and the author of the Book of Jonah.

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Micah -

The prophet from the Southern Kingdom of Judah wrote the Book of Micah. Micah 5:2 is interpreted by some as a prophecy that Jerusalem would be the birthplace of Jesus.

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Nahum -

Prophet Nahum uses the term Elkoshite to identify himself, but we don’t really know what it means. It’s likely a place, but such a place is also unknown. He’s the author of the Book of Nahum.

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Habakkuk -

Like other minor prophets, not much is known about Habakkuk. His writings can be found in the Book of Habakkuk, which is believed to date back to the late 7th century BCE.

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Zephaniah -

Prophet Zephaniah authored one of the shorter Old Testament prophetic books: the Book of Zephaniah.

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Haggai -

Haggai’s prophecies can be found in the Book of Haggai. The message revolves around the rebuilding of the second Jerusalem temple.

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Zechariah -

Prophet Zechariah also urges his people to complete the temple, in the Book of Zechariah.

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Malachi -

The last of the prophets to be included in the Old Testament wrote the Book of Malachi.

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Matthew -

This apostle of Jesus authored one of the three synoptic Gospels. Matthew (also called Levi in other gospels) wrote the first book of the New Testament: the Gospel of Matthew.

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Mark -

Apostle John Mark, best known as simply Mark, is first mentioned in the book of Acts. According to most Church traditions, authorship of the Gospel of Mark is attributed to John Mark (who was a companion of Peter the Apostle), but some scholars reject this.

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Luke -

Luke the Evangelist (the companion of Paul the Apostle) is credited by some traditions as the author of a large part of the New Testament. This theory has been challenged by some scholars, but the Gospel of Luke remains one of the most relevant in the Bible, regardless of which Luke actually wrote it.

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John -

A faithful apostle, John followed Jesus and went on to contribute to Christianity by writing the Gospel of John and the apocalyptic Book of Revelation.

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Paul -

Paul the Apostle wrote numerous letters to Christians and churches spread around the world. The Epistles of Paul constitute an important part of the Bible. He wrote to the Galatians, Thessalonians, Corinthians, Romans, Ephesians, Philippians, Colossians, and the Philemon. Paul also penned three pastoral epistles, which can be found in 1 and 2 Timothy and Titus.

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James -

James, the brother of Jesus, also made his contribution to the New Testament, by writing the Book of James (or Epistle of James). This is essentially a letter to the Jewish Christians scattered outside of Israel.

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Peter -

Peter was the leader of the Twelve Apostles and one of the most important figures in the early Church. His writings can be found in 1 and 2 Peter.

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Jude -

Jude was the younger brother of both James and Jesus. He became a believer after the resurrection of Jesus, and wrote the Epistle of Jude.

Sources: (OverviewBible) (Bible Gateway) (Britannica)

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