Title: John the Evangelist
Content:  the apostle John wrote none of these works, although some, such as J.A.T. Robinson, F. F. Bruce, Leon Morris, and Martin Hengel, hold the apostle to be behind at least some, in particular the gospel.<ref name="Morris1995">Morris, Leon (1995) The Gospel According to John Volume 4 of The new international commentary on the New Testament, Wm. B. Eerdmans Publishing, ISBN: 978-0-8028-2504-9, pp. 4–5, 24, 35–7. "Continental scholars have ... abandoned the idea that this gospel was written by the apostle John, whereas in Great Britain and America scholarship has been much more open to the idea." Abandonment is due to changing opinion rather "than to any new evidence." "Werner, Colson, and 
Title: The Gospel According to John (Pillar New Testament Commentary)
Content:  The Gospel According to John is a part of the Pillar New Testament Commentary series. It provides a comprehensive introduction to the Gospel of John. It was published in 1990 and written by D. A. Carson, who is also the General Editor of the series. In 1992, Christianity Today magazine awarded it Number 1 Critic's Choice for Commentaries and Runner-up Reader's Choice.
Title: Gospel of John
Content:  The Gospel of John, like all the gospels, is anonymous. references a disciple whom Jesus loved and says: "This is the disciple who is testifying to these things and has written them, and we know that his testimony is true; but there are also many other things that Jesus did; if all of them were written down, I suppose that the world itself would not contain the books that would be written." Early Christian tradition, first attested by Irenaeus (c. 130 – c. 202 AD), identified this disciple with John the Apostle, together with the Gnostics, such as Ptolemy who in his letter to Flora quotes the Gospel and attributes it 
Title: Gospel of John
Content:  an Apostle without giving names and Basilides who quotes and considers it a gospel, but most scholars have abandoned this hypothesis or hold it only tenuously – for example, the gospel is written in good Greek and displays sophisticated theology, and is therefore unlikely to have been the work of a simple fisherman. These verses imply rather that the core of the gospel relies on the testimony (perhaps written) of the "disciple who is testifying", as collected, preserved and reshaped by a community of followers (the "we" of the passage), and that a single follower (the "I") rearranged this material and perhaps added the final chapter and other passages to produce 
Title: John the Apostle
Content:   Church tradition has held that John is the author of the Gospel of John and four other books of the New Testament—the three Epistles of John and the Book of Revelation. In the Gospel, authorship is internally credited to the "disciple whom Jesus loved" (ὁ μαθητὴς ὃν ἠγάπα ὁ Ἰησοῦς, o mathētēs on ēgapa o Iēsous) in. claims that the Gospel of John is based on the written testimony of the "Beloved Disciple". The authorship of some Johannine literature has been debated since about the year 200. In his Ecclesiastical History, Eusebius says that the First Epistle of John and the Gospel of John are widely agreed upon as his. However, Eusebius mentions that the consensus is that the 
Title: AD 90
Content: The Gospel of John is drafted. 
Title: John 20
Content: Barrett, C.K. The Gospel According to John, 2nd Edition. London:SPCK, 1978. ; Brown, Raymond E. "The Gospel According to John: XIII-XXI" The Anchor Bible Series Volume 29A New York: Doubleday & Company, 1970. ; Bruce, F.F. The Gospel According to John. Grand Rapids: William B. Eerdmans Publishing Company, 1983. ; Leonard, W. "St. John." A Catholic Commentary on the Bible. D.B. Orchard ed. New York: Thomas Nelson & Sons, 1953. ; Rudolf Schnackenberg. The Gospel According to St. John: Volume III. Crossroad, 1990. ; Westcott, B.F The Gospel of St. John. London: John Murray, 1889. 
Title: Johannine community
Content:  Eyewitnesses: here, Bauckham argued that the Gospel of John was actually written by John the Presbyter, who was, in his view, the Beloved Disciple. He also considers him to be the author of the Johannine Epistles, while the Book of Revelation was, according to Bauckham, written by John of Patmos. This views echo those of Lutheran scholar Martin Hengel, who had theorized in 2000 that the Gospel of John and the Johannine Epistles were authored by John the Presbyter, who, in his view, was a disciple of John the Apostle; in turn, Hengel viewed John the Presbyter as the teacher of Papias of Hierapolis, a 
Title: Gospel of John
Content:  the Christ, the Son of God, and that believing you may have life in his name." John reached its final form around AD 90–110, although it contains signs of origins dating back to AD 70 and possibly even earlier. Like the three other gospels, it is anonymous, although it identifies an unnamed "disciple whom Jesus loved" as the source of its traditions. It most likely arose within a "Johannine community", and – as it is closely related in style and content to the three Johannine epistles – most scholars treat the four books, along with the Book of Revelation, as a single corpus of Johannine literature, albeit not from the same author.
Title: New Testament
Content:  The Gospel of John, the three Johannine epistles, and the Book of Revelation, exhibit marked similarities, although more so between the gospel and the epistles (especially the gospel and 1 John) than between those and Revelation. Most scholars therefore treat the five as a single corpus of Johannine literature, albeit not from the same author. The gospel went through two or three "editions" before reaching its current form around AD 90–110. It speaks of an unnamed "disciple whom Jesus loved" as the source of its traditions, but does not say specifically that he is its author; Christian tradition identifies this disciple as the apostle John, but while this 

Question: who wrote the gospel according to john?
Answer: John the Evangelist.