It's possible that:
* The name is incorrect or incomplete: Perhaps the author's name is slightly different or has initials that are not J.S.
* The author is not widely known: There may be many authors with less prominent names, and their works may be less easily accessible.
* You may be thinking of a different field: If you are looking for an author in a specific genre or field, it's possible that the author is not a writer but someone working in another area like academia or science.
To get more information, it would be helpful to provide:
* Any other details you know about the author: Genre, time period, titles of books, etc.
* The context of your question: Are you looking for specific books, information about their life, or their writing style?
With more information, it might be possible to identify the author you're looking for.