Pebble In The Sky
by Isaac Asimov
Considered part of the
Galactic Empire series which I have not read more of. Literally between footsteps Joseph Schwartz, a retired suburban tailor from Chicago finds himself thrown tens of thousands of years into the future. Asimov very effectively uses the fish-out-of-water trope to introduce the reader to a future where Earth is mostly radioactive, the galaxy is ruled by an Empire and Earthmen are looked down upon by the rest of the galaxy. He also introduces us to a rich cast of characters makes some interesting comments on xenophobia. This also marks one of the occasions where he references Trantor outside of the the Foundation series.