Model Speakers (Public speakers I admire)

From your own experience, which might include having heard a public speaker at some event you attended, or from your viewing experience in the past on any venue where you may have heard a public speech, or from any current websites (TED talks, others, etc.), or from a site such as americanrhetoric.com, tell us of at least one (you can have more) public speech or speaker you admire, and tell us why you admire them. If you have browsed through any material from our textbook, or read any other material explaining public speaking, you are welcome to refer to it (just please use any citation system to enable us to find it; it doesn't need to be formally MLA or APA or anything else, just practically let us be able to find your source).