Allison Shapira, trainer and coach for public speaking, wrote an excellent piece on HBR.org on how to speak more persuasively in public. And the key is not necessarily a well written speech but it is rather the way that you speak and use your voice. So check out https://hbr.org/2015/06/breathing-is-the-key-to-persuasive-public-speaking for some effective speaking advice. I’ll consider it in writing the new chapter on executive communication.