Who wrote the Gospel of Mark
The author of the Gospel is John Mark, nephew of Barnabas. He accompanied Paul and Barnabas on their first missionary journey in Acts 13:13, but he left to go home at the second stop.
Paul wasn’t happy about this. In fact two years later when preparing for their second journey, Barnabas again suggested Mark as a traveling companion and Paul refused. So Barnabas and Paul split up: Barnabas taking Mark and Paul taking Silas.
This ended up working for the good because two groups could cover twice as much area. And also, remember, Barnabas is known as the encourager and during his time with Mark, Mark grew.
Eventually he and Paul re-united and became close. Mark and his mother’s house was one of the meeting places for the new Christians in Jerusalem and Mark got a lot of his eyewitness accounts from Peter.