Most evangelical Christians hold that the Gospel of John — and therefore the speaker/writer behind John 10:7, 9–10 — is the Apostle John, often called “the beloved disciple.” Below is a concise summary of who that person is considered to be and why evangelicals take him as the most likely author.

Who he is
– John the son of Zebedee: one of the original twelve apostles, brother of James, a fisherman called by Jesus (see Matt. 4:21–22; Mark 1:19–20). He belonged to Jesus’ inner circle (Peter, James, John) and is linked with several eyewitness moments (Peter’s denial, Transfiguration, Gethsemane).
– The “beloved disciple”: The Gospel itself repeatedly refers to an unnamed “disciple whom Jesus loved” (e.g., John 13:23; 19:26; 21:7,20). John 21:24 presents that beloved disciple as the source of the Gospel’s testimony: “This is the disciple who is bearing witness about these things, and who has written these things.”
– Eyewitness status: Evangelicals emphasize that the author claims close, personal knowledge of Jesus and signs (miracles) — lending historical credibility to eyewitness authorship.

Why evangelicals favor John the Apostle as the author
– Internal testimony: The Gospel’s self-presentation (the “beloved disciple” as the witness and author) points to an eyewitness from Jesus’ inner circle.
– Early church testimony: Patristic writers (notably Irenaeus, drawing on age-old tradition going back to John’s disciples in Asia Minor) identify John the Apostle as the Gospel’s author and locate him in Ephesus in the late first century. Early writers such as Papias, Irenaeus, Clement of Alexandria, and Tertullian provide consistent testimony.
– Theological and linguistic unity: Evangelical scholars note the distinctive themes and vocabulary shared between the Gospel of John and the Johannine epistles (light/darkness, life, truth, love, believe/faith), supporting common authorship or at least close association with the apostle’s circle.
– Pastoral purpose consistent with apostolic intent: The Gospel explicitly states its purpose — to bring people to faith in Jesus as the Christ and Son of God (John 20:31) — which fits an apostle’s mission to testify to Christ.

Dating and provenance
– Common evangelical dating places the Gospel in the late first century (often c. 85–95 AD), likely written from Ephesus or somewhere in Asia Minor where John and his circle ministered.

How that affects reading John 10:7, 9–10
– Because evangelicals see the Gospel as rooted in apostolic eyewitness testimony, they read Jesus’ claims (e.g., “I am the door… I came that they may have life, and have it abundantly”) as authoritative, historically grounded, and theologically central to Christian faith and salvation.
– The Johannine emphasis on eternal life by faith and the exclusivity of Christ as the way is consistent across the Gospel and informs evangelical preaching and devotion.

Brief note on alternative views
– Modern critical alternatives propose an anonymous “Johannine community” or a different Johannine figure (e.g., “John the Elder”), or see the Gospel as a later theological product. Evangelicals usually acknowledge scholarly debate but maintain that the internal and early external evidence favor the apostle John as the most likely author.

Further reading (evangelical-friendly)
– D. A. Carson, The Gospel According to John (pillar commentary)
– Leon Morris, The Gospel According to John
– Andreas J. Köstenberger, John (BECNT)
These give conservative, evangelical treatments of authorship, theology, and interpretation.

If you’d like, I can summarize how John’s apostleship and eyewitness perspective shape the meaning of John 10:7, 9–10 specifically (the “door” imagery, the contrast with the thief, and the promise of abundant life).