Which director has often been colloquially known as "The King of the B's"?

Question

Answer 1

Roger Corman

American film producer/director Roger Corman made nearly 400 films, many cheap B-movies for American Independent Pictures (AIP). He had a prolific career in low-budget exploitation cinema created for drive-ins or other cheap theatrical venues. A recent biographical documentary was released, titled: King of the B's: The Independent Life of Roger Corman (2011).