There is not any one person to whom we can attribute the authorship of the Bible. Many people contributed to it depending on their ideas and perspective in making it what it is today.
If we talk about the Old Testament, 30 people contributed in it, and 10 contributed in the New Testament. This means the Bible has 40 contributors in total. The first five books of the Old Testament are said to be written by Moses, and are known as Torah. Torah is also the holy book of Jews. These are known as the “five books of Moses” by Jewish people.
King David is regarded as the author of the Book of Psalms and his son Solomon is credited with the authorship of the wisdom literature (for example Proverbs) in the Bible.
Apart from these, the Old Testament also contains the teachings of Isaiah, Jeremiah, Amos, etc. The Old Testament, which is originally in Hebrew, is regarded as the Holy Scripture by Jews.
Now coming to the New Testament, it is the one which was first circulated through Christian Churches. This contains the teachings of the apostles of Jesus including Paul and Peter. Apart from the teachings, stories, and letters of the apostles of Jesus, the New Testament contains a section on life of Jesus known as “Luke and Acts”. The author of this segment is said to be Luke, the travelling companion of the apostle Paul.
Then there is the Gospel of Matthew, penned by Matthew and Mark’s Gospel, written by John Mark.
The Gospel of John holds an immense importance as it was written by one of the closest disciples of Jesus himself, and relates the first hand account of the life of Jesus.
So we can say that Bible has multiple authors and these authors include the followers or apostles of Jesus.