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I remember the writer because he came to give a talk at my junior high.. he was a pugnacious asshole, and promised us that R.L. Stine was not a real guy, but rather a group of other writers on the Scholastic roster. He knew this because he was invited to write a Goosebumps book. That's the only reason I have the slightest memory of his books.

I'm thinking of a children's book series that was published by Scholastic, in Canada, in the '90s. It centered around BMX stunt riding, and was by a Canadian author, a male. Either he was named Marty or one of his characters was.