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– -Mr Zimmerman in Dork Diaries: Tales from a Not-So-Smart Miss Know-It-All
Nikki describes Mr. Zimmerman as an insane middle-aged man. He likes to drink coffee, eat Pez candies out of a Scooby Doo Pez dispenser, and watch SpongeBob SquarePants. He is rude and snarky, but at the same time, she likes him for giving her a chance to be Miss-Know-It-All and awarding her a certificate.
In Dork Diaries 9: Tales from a Not-So Dorky Drama Queen,he created the Miss Know it All Website, and accidentally used his to do list for the username and password.
He was mentioned in Dork Diaries: Tales from a Not-So-Perfect Pet Sitter, when Nikki asked Brandon about the free pizza he got back in book 9.
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Mr. Zimmerman has glasses and wears wrinkled clothing. He has an unevenly shaved face and scruffy hair and he has hair in his arms.