Authorship of the Johannine works

The authorship of the Johannine works (the Gospel of John, the Johannine epistles, and the Book of Revelation) has been debated by biblical scholars since at least the 2nd century AD. The debate focuses mainly on the identity of the author(s), as well as the date and location of authorship of these writings. Although authorship of all of these works has traditionally been attributed to John the Apostle, most scholars theorize that he wrote none of them, though the tradition still has many modern defenders.

Source: Wikipedia — Authorship of the Johannine works (CC BY-SA 4.0)