From Robert Silverberg’s “Earthmen and Strangers” anthology, 1966:
Damon Knight is a slender, soft-spoken man with a deceptively mild smile. He seems gentle and relaxed, but behind the tranquil exterior there seethes a fiercely active...
It is the early 21st century, and Ed Stone says he's been in suspended animation since the 1930s--put there by aliens who have sent him on a mission: convince the nations of the world to build a massive vault, in which humanity's billions will lie...