Carl Ritter
Pyotr Semenov was born into a noble family and studied at Saint Petersburg University. Together with Fyodor Dostoyevsky, Semenov attended secret meetings of the "Petrashevsky Circle" (a literary discussion group of progressive-minded commoner-intellectuals in St. Petersburg). During the 1850s he studied geography and geology in Berlin under Alexander Humboldt and Carl Ritter, whose writings he translated into Russian.