377px-How to train your dragon

Professor Yobbish has spent many years in the wild observing dragons in their natural habitat. One of his books is the culmination of his research on these fascinating creatures. Professor Yobbish lives alone in a cave on the Isle of Doom.

As well as How to Train Your Dragon, he has written books on sharks and killer whales. He is currently writing a book about butterflies. How to Train Your Dragon is dedicated to his mother.

When Stoick sends a letter to him, complaining about the lack of words in How To Train Your Dragon ("Yell at it!"), he publishes a second edition ("Yell at it loudly!").