Dr. Ryuta Kawashima is the man most well-known as the face in Brain Age. He was also crucial to the series' development.
As you might recall, the franchise was an extremely popular one for Nintendo, raking in all kinds of cash. This amounted to $11 million in royalties alone for Dr. Kawashima, but he didn't keep that money for himself. Instead, he turned around and gave all $11 million to organizations dedicated to researching the brain. Dr. Kawashima explained the decision to Brain World Magazine.
“Two reasons: Firstly, it was too huge for my pocket. If I received 1,500 Euros, I would have probably taken it as pocket money and kept it a secret from my wife. Secondly, I made games as one of my research activities at the university. Therefore, I simply thought the royalty should belong to my university.”