"Hmm..." Alistaire considers the matter. "The Chronal Variance Authority will generally find you if they decide its necessary. Likewise with A.R.M.O.R.

I can offer you a place to stay, and a chance to earn your keep, in the meantime. I can always use resourceful people on my staff, and you seem like you qualify." He sits up and starts typing on a tablet. "First priority is finding out how closely this Earth and this timeline aligns with your own." He works out about two dozen questions, ranging from the trivial to the broad. "Here, answer these the best you can."

Because if he can know which wars or stocks to invest in, along with who might be worth saving from a horrible death, that's just good business.