- His favorite writers include Raymond Chandler, Mikhail Bulgakov, Umberto Eco, and Ernest Hemingway.
- He wrote the first Witcher short story for the Polish Sci/Fi Fantasy magazine Fantastyka, at the request of his son, who was a fan of the magazine.
- His Witcher series is heavily influenced by Slavic mythology.
- He is often called the "Polish Tolkien".
- He was a traveling salesman before becoming a writer.
- The Netflix adaption of his series The Witcher boosted sales for his books on Amazon, putting him in the company of authors such as J.K Rowling and Stephen King.
- He is a cat lover, and will include cats in his writing.
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