Russian pianist and musicologist (b. 1874), born Aleksandr Georgievich Zverzhansky (Александр Георгиевич Звержанский).
Correspondence with Tchaikovsky
One letter from Tchaikovsky to Aleksandr Zverzhansky has survived, dating from 1891, and has been translated into English on this website:
3 letters from Zverzhansky to the composer, dating from 1891 and 1892, are preserved in the Klin House-Museum Archive.