This article is by Jonathan McLatchie. He begins:
Much of the book of Acts — about 50% — is comprised of speeches, discourses and letters. Among them, a total of eight speeches are given by Peter; a total of nine speeches delivered by Paul; there is Stephen’s famous address before the Sanhedrin (Acts 7:2-53); a brief address at the Jerusalem Council by James (Acts 15:13-21); the advice given to Paul by James and the Jerusalem elders (Acts 21:20-25); in addition to the letter to the Gentile churches from the Jerusalem Council (Acts 15:23-29) and the letter to Governor Felix from Claudius Lysias (Acts 23:27-30).
An interesting question that we can investigate pertains to whether these speeches and other addresses are historically authentic, or whether they instead represent the invention of Luke, the author of Acts. It is this question with which this essay is concerned.
See the full article via The Speeches in Acts: Are They Authentic?.