Booking Through Thursday: Favorite Unknown

This post is part of the Booking Through Thursday meme.
Who’s your favorite author that other people are NOT reading? The one you want to evangelize for, the one you would run popularity campaigns for? The author that, so far as you’re concerned, everyone should be reading–but that nobody seems to have heard of. You know, not JK Rowling, not Jane Austen, not Hemingway–everybody’s heard of them. The author that you think should be that famous and can’t understand why they’re not…
Picture book author: Robert Munsch.   I have the joy of introducing students to Robert Munsch every year.  Because he's Canadian, kids often don't see his books in bookstores in the States. The only Munsch title they are likely to be familiar with is Love You Forever, which is, needless to say, not funny.  He's the one who hooks even the most reluctant listener into gales of laughter.

Chapter book author: William Sleator.  Kids are always asking for scary books.  They eat up the Goosebumps and Michigan/American Chillers and Alvin Schwartz folktale series.  As they get older, I point to this author and whisper, "He's scarier than anything you've ever read."  Interstellar Pig?  Nightmare-inducing.  The Boxes?  Brrrr.   House of Stairs?  Creepy beyond belief.

Teen author: Julian Thompson.  I was obsessed with The Grounding of Group 6 as a teen.  I didn't read any of Thompson's other books until I was in my 20s, but when I did I was pleased to read they were as quirky and strangely compelling as my original obsession.

What authors do you love that no one's heard of?