Who were the gospels written by?

The gospel John was written by St. Iraneaus, who has been identified as the beloved apostle John.

The gospel of mark was written by Peter's secretary because the gospel seems to have some connections to peter's preachings.

The author of the gospel of Matthew was most likely a jewish scribe. This scribe knew an abundance of Jewish customs.

The gospel of Luke was written by Luke, a Gentile Christian who respected Judaism and might have wanted to convert at some point in his life.