Who actually wrote these gospels, do we think?
Traditionally, John Mark, an associate of Peter, wrote the gospel of Mark. This makes him one step away from being an eye-witness to Jesus.
Traditionally, the disciples Matthew and John wrote the first and last gospels. That would make them direct witnesses to Jesus.
Why then, would Matthew rely so heavily on the writings of Mark? If he had, in fact, been present to see for himself? And why would he, like Luke, rely on yet another source of information (the theoretical Q)?
Luke, traditionally, was a physician, an educated man, and the travelling companion of Paul. His reliance on others' material makes sense to me.
Is there current scholarship on the identity of these authors, does anyone know?