* The name is misspelled. Double-check the spelling.
* The author is not well-known. He may have written works in a specific language or genre that have not gained international recognition.
* The author's full name is different. Josef may be a middle name or a nickname.
To help me find the author, please provide more information:
* Any other details about the author or their works: Country of origin, genre, approximate time period of publication, titles of any known works, etc.
* The context where you encountered the name: A book you read, a website you visited, a lecture you attended, etc.
With more details, I can try to identify the author and their works.