Author: Prophet Isaiah
The book derives its title from the author, whose name means “The LORD is salvation,” and is similar to the names Joshua, Elisha, and Jesus. Isaiah is quoted directly in the NT over 65 times, far more than any other OT prophet, and mentioned by name over 20 times. (Source: pastor John MacArthur)
Why is Isaiah so important?
The book of Isaiah provides us with the most comprehensive prophetic picture of Jesus Christ in the entire Old Testament.
It includes the full scope of His life: the announcement of His coming (Isaiah 40:3–5), His virgin birth (Isiah 7:14), His proclamation of the good news (Isiah 61:1), His sacrificial death (Isaiah 52:13–53:12), and His return to claim His own (Isiah 60:2–3). Because of these and numerous other Christological texts in Isaiah, the book stands as a testament of hope in the Lord, the One who saves His people from themselves. (source: overview – Charles Swindol)