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You're fired!

– -Mr Zimmerman in Dork Diaries: Tales from a Not-So-Smart Miss Know-It-All

Mr. Zimmerman is a school newspaper adviser, who was introduced in Dork Diaries: Tales From A Not-So-Smart Miss Know-It-All, and has appeared in 2 books since. He started an advice column for Nikki Maxwell, called "Miss Know-It-All." He is described as a "psychopath." He used to be an editor in the Wall Street Journal.


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.