Andy Stanley and Lane Jones. Communicating for a Change. Sisters, OR: Multnomah, 2006.
It’s filled with insights about public speaking in general, so it’s worth reading even if you deeply disagree with it at points along the way.
The book compares preachers to performers. In one sense there’s something to that since both preachers and performers—whether stand-up comedians or actors on a stage—must engage their audience. And to their credit, the authors qualify that “acting and preaching are a bit different” (p. 134).
But this is a good example of how a controlling metaphor can slant an argument. Why not choose the metaphor of a herald (κῆρυξ)? After all, the New Testament itself uses that metaphor in 1 Tim 2:7 and 2 Tim 1:11 (not to mention the 61 occurrences of the main verb for preaching: κηρύσσω).