The 1960s and 1970s were the era of one writer. Lem set the boundaries of the genre; Lem defined the genre; all young writers reflected Lem and competed with Lem. How could one author so completely dominate an entire literary category? It’s simple: he was quite simply a genius, with a mind that could fully display its powers precisely within the domain of science fiction.

T. Kolodziejczak "Words Without Borders"