Professor What?

After Jonas finished reading me a story, he noticed the page at the end of the book that had a brief bio of the author. Our conversation went like this:

JONAS: What does it say, Dad?

FONDLYSAM: The person who wrote this book is an author and a professor.

J: What's a professor?

FS: A person who teaches college students.

J: Ummm - like who?

FS: Well, I'm--

J: Oh, I remember now - in the book Captain Underpants--

FS: --a professor.

J: No, Dad - I'm thinking of Professor Poopypants.

FS: Sure, I guess - him, too.