Anyone from our time, but not necessarily by someone from before our time. Rember, the three words have to be instructive, and offer an effective course for tipping the eventual outcome...or else they're of no use.
My bet? Hellroaring Jake Smith.
I don't think so, because I think the Time Traveller is actually the author's grandson (the one still fighting).
I don't think the words are in the story. They're described as "Three words that any Replayer or time traveler visiting here from a century or more from now would react to first and most emotionally...." The author uses two examples of such words in the story: first, from the novel Replay, when the time traveller there posted ads that read, "Do you remember Three Mile Island, Challenger, Watergate, Reaganomics?..." The second example was when the author thought of what words he would use to contact a time traveller in 1900: "Auschwitz, I was sure, and Hiroshima and Trinity Site and Holocaust and Hitler and Stalin and ..."
So I think the words are on that order, three words that refer to people, places, or events that everyone from the Time Traveller's time would recognize as significant, but anyone in our time would be baffled by.
Bingo! Something along the lines of "Atlanta, Seattle, Houston"... or three equivalent places that were destroyed by Islam in some huge attack that shocked the world. The author left them intentionally vague.
Anyone from our time, but not necessarily by someone from before our time. Rember, the three words have to be instructive, and offer an effective course for tipping the eventual outcome...or else they're of no use.
My bet? Hellroaring Jake Smith.