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Hugh Walker is the pen name of Hubert Straßl, an Austrian Science Fiction and Fantasy author.
Auto-translated from his own website:
Hubert Straßl, born on February 4, 1941 in Linz, Austria, is an example of such entertainment authors who bring more into their novels than just routine tension. The range of topics covered by him ranges from science fiction to fantasy and horror to short crime novels; in addition - as a kind of bread business - with his wife Lore a broad-based translation job.