It's possible that:
* You've misremembered or misspelled the name. There are many authors with similar names, such as Henry Seidel Canby.
* The author is not well-known. It's possible they have written independently or under a pseudonym.
Could you please provide more information about the author or their work? For example:
* Any titles of their books or articles
* The genre they write in
* Any other details about their writing style or background
With more information, I might be able to help you find the author you're looking for.