What qualified Mark to write a gospel?

A:The gospel now known as Mark's Gospel was originally anonymous, but was attributed to Mark by the second-century Church Fathers, on the basis that Mark could have learnt about Jesus during his time as a companion of the Apostle Paul. The early second-century First Epistle of Peter (verse 5:13) even suggests that Mark was the son of St Peter.

However, biblical scholars do not believe it likely that Paul's companion, Mark, was the person who actually wrote Mark's Gospel. They do not know who wrote the Gospel and what qualified him for the task. Certainly, this was the most important gospel in the New Testament, as it can be demonstrated that the authors of the other gospels, who were also anonymous, relied directly or indirectly on Mark for everything they knew about the life and mission of Jesus.