Paul was the author. He was from the city of Tarsus. He had been known as Saul in his early life. Before becoming a Christian, Paul was a Pharisee. He persecuted Christians. After he became a Christian, he traveled several times throughout the Roman Empire telling people about Jesus.
In 2 Corinthians, Paul continued to write about the conflicts among the Christians in the city of Corinth. It is clear in this letter that the Corinthians had obeyed his previous instructions to them. In 2 Corinthians, Paul encouraged them to live in a way that would please God.
Paul also wrote to assure them that Jesus Christ sent him as an apostle to preach the Gospel. Paul wanted them to understand this because a group of Jewish Christians opposed what he was doing. They claimed Paul was not sent by God and that he was teaching a false message. This group of Jewish Christians wanted Gentile Christians to obey the law of Moses.