- One of the Belgian masters of the Gothic novel.
- A few weeks before his death, he wrote his own mock epitaph in a letter to his friend Albert van Hageland: Ci gît Jean Ray/homme sinistre/qui ne fut rien/pas même ministre ("Here lies Jean Ray/A man sinister/who was nothing/not even a minister").
- Between 1933 and 1940, Ray produced over a hundred tales in a series of detective stories, The Adventures of Harry Dickson, the American Sherlock Holmes. He had been hired to translate a series from the German, but Ray found the stories so bad that he suggested to his Amsterdam publisher that he should re-write them instead. The publisher agreed, provided only that each story be about the same length as the original, and match the book's cover illustration. The Harry Dickson stories are admired by the film director Alain Resnais among others. During the winter of 1959-1960 Resnais met with Ray in the hope of making a film based on the Harry Dickson character, but nothing came of the project.
- During 1926 he was charged with embezzlement and sentenced to six years in prison, but served only two years. During his imprisonment he wrote two of his best-known long stories, The Shadowy Street and The Mainz Psalter. From the time of his release in 1929 until the outbreak of the Second World War, he wrote virtually non-stop.
- He wrote under the pseudonyms Jean Ray, John Flanders, Tekla G., Haigh, Larssen Hegel, Ambrosius Acker, Acel Reiss, Jerry M. Temple, Brenford Dales, Albin D. Young, WW. Woodcock, Sedgemoor, Sidney Irving, Andrew Foyle, Eustace Gill-Banks, J. White-Stewart, Kapitein Bill.
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