Short answer
– From an evangelical Christian perspective, the most likely author of Isaiah 25:1 is the prophet Isaiah (Isaiah son of Amoz), the eighth‑century B.C. prophet active in Judah.

Why evangelicals hold Isaiah son of Amoz as the author
– The book itself names Isaiah as the prophet (Isaiah 1:1) and contains clear internal connections (Isaiah 6, the prophet’s call, other autobiographical notes).
– Jewish and early Christian tradition uniformly attribute the book to Isaiah, and the New Testament repeatedly cites Isaiah as scripture (Jesus and New Testament writers treat Isaiah as authoritative prophetic material).
– Many conservative/evangelical commentators and pastors defend single‑author Isaiah as historically and theologically coherent (e.g., J. Alec Motyer and other evangelical commentators).

Who Isaiah was (brief bio)
– Lived and prophesied in Jerusalem during the reigns of Uzziah, Jotham, Ahaz, and Hezekiah (8th century B.C.; Isaiah 1:1).
– Had a public prophetic ministry warning of judgment for sin and calling Israel/Judah to repentance, while also announcing future restoration and God’s salvation.
– Experienced a dramatic divine call (Isaiah 6) and had a family referenced in the book (e.g., sons whose names carried prophetic significance).

How that matters for interpreting Isaiah 25:1
– Isaiah 25:1 is a short hymn of praise that fits the prophet’s characteristic themes: God’s holiness and sovereignty, God’s faithfulness to long‑laid plans, judgment of the proud, and ultimate salvation.
– Reading the verse as Isaiah’s own praise ties it to his historical context (opposition, threat from nations) while also allowing evangelical readers to see it as part of the book’s wider messianic and eschatological hope (cf. the celebratory images later in ch. 25 — a banquet, destruction of death, etc.).

Suggested conservative/evangelical resources
– J. Alec Motyer, Isaiah: An Introduction and Commentary (IVP)
– John MacArthur, The MacArthur Bible Commentary (notes on Isaiah)
– An ESV/NASB study Bible with conservative notes

If you’d like, I can:
– Show how Isaiah 25:1 reads in several English translations,
– Summarize the immediate literary context of ch. 25,
– Or give a short evangelical devotional reflection on the verse.