Who is the author of ignorant man?

There is no book or work commonly known as "Ignorant Man." It's possible you are misremembering the title or author.

To help me find the work you're looking for, could you provide more information? For example:

* What is the genre of the book? (Fiction, non-fiction, etc.)

* What is the main theme or subject of the book?

* Do you remember any details about the plot or characters?

* Do you know anything about the author?

With more information, I can assist you in finding the author you are looking for.