Albert Barnes Commentary 2 Chronicles 26:22

"Now the rest of the acts of Uzziah, first and last, did Isaiah the prophet, the son of Amoz, write." — 2 Chronicles 26:22 (ASV)

The acts of Uzziah... Isaiah wrote: Most critics believe Isaiah was about 20 years old when Uzziah died. He must, then, have written his history of Uzziah’s reign from documents and the accounts of others, rather than from his own knowledge.