Short answer
– Most evangelicals identify the author of the Epistle of James (and therefore the writer of James 4:10) as James “the Lord’s brother” (often called James the Just), the well‑known leader of the Jerusalem church. This is the traditional and majority view in conservative and evangelical scholarship.

Why evangelicals hold this view
– The letter names the author simply as “James” (James 1:1) with no further qualification. In the early church a bare name usually meant a highly visible, well‑known person — and James the brother of Jesus was such a figure.
– New Testament corroboration: Paul calls James “the Lord’s brother” and a prominent leader (Galatians 1:19; Galatians 2:9). Acts 15 and other passages show a James who was a leading authority in the Jerusalem church.
– Early church testimony: Church fathers (e.g., Clement of Alexandria, Hegesippus as reported by Eusebius) attribute the letter to James the Just.
– Extra‑biblical confirmation of James’s prominence and death appears in Josephus (Antiquities) and later Christian writers; Josephus mentions the execution of “James, the brother of Jesus, who was called Christ,” around AD ~62, which fits the traditional picture of James as a prominent Jerusalem leader.

Dating and audience (typical evangelical position)
– Many evangelicals date James early — before AD 70 (often in the 40s–60s). Reasons include the letter’s Jewish‑Christian character and no clear dependence on the written Gospels.
– The addressee is given as “the twelve tribes scattered abroad” (James 1:1), which suggests Jewish Christians living in the Diaspora. The tone and concerns fit a Jewish‑Christian leader writing pastoral, ethical exhortations to believers under social pressures and temptation.

Portrait of James the author (from an evangelical perspective)
– Identity: James the son of Mary and Joseph’s family — called one of Jesus’ brothers in the Gospels and in Paul (Mark 6:3; Matthew 13:55; Galatians 1:19). Evangelicals differ on the exact sense of “brother” (biological half‑brother vs. close relative), but many evangelical commentators accept a biological brotherhood as the plain meaning.
– Role: Leader of the Jerusalem church, respected for piety and moral authority (hence the title “James the Just” used in patristic sources).
– Character of the letter: James is pastoral and ethical rather than primarily doctrinal. He writes practical wisdom‑style instruction (similar to Proverbs) about faith and works, trials, speech, wealth, humility, and repentance. James 4:10 (“Humble yourselves before the Lord, and he will exalt you”) is typical of his call to humble dependence on God and practical holiness.

How James 4:10 fits James’s concerns
– James consistently calls for humility, repentance, and turning from worldliness (see James 4:1–10). Verse 10 is a succinct pastoral exhortation summing his ethic: submit to God, repent, be lowly in spirit, and God will vindicate or exalt you in his time. Evangelicals generally read this as a call to genuine repentance and reliance on God’s gracious work, not as a promise of self‑help vindication apart from faith.

Alternative views and evangelical responses
– Some modern scholars have proposed other authors (e.g., a later pseudonymous writer, or one of the apostles named James). Evangelicals typically reject pseudonymous authorship and favor the early, authentic James because the internal character of the letter, early church testimony, and New Testament references point to James the Lord’s brother.

If you want, I can:
– Provide a short biography of James the Just with scriptural and early‑church citations, or
– Walk through James 4:1–10 verse‑by‑verse in light of James’s overall theology.