Hakase

The Professor (ハカセ Hakase?) is Natsumi's grandfather and the inventor of the Peak Point Helmets (also known as Pipo Helmets). He is a good man at heart, though he can be a little distracted at times. He handles things in the lab and creates gadgets for Kakeru to use. He appears in Ape Escape, Ape Escape 2, has a cameo in Ape Escape 3, is one of the characters in Ape Escape: Pumped & Primed and appears in Ape Escape Million Monkeys. In Ape Escape: SaruSaru Big Mission, he has been captured by White Monkey. He also appears in the anime and Frederator cartoon. In Ape Escape (1999), his name is revealed to be Dr.

Ozel in the training rooms, but the Ape Escape cast call him Professor in both the Japanese and English versions of the game (Wikipedia)