Author
He's a naturopath. Fake doctor in my opinion. His credentials are easily found on his real website - http://www.dadamo.com/
Benefit
His advice - while very silly - won't kill you if you follow it. You'll eat better and get healthier while pretending that your blood type has anything to do with your improvement.
This book is endorsed by Dr. Oz.
As one can imagine, the book isn't well received by real doctors.
https://www.quackwatch.org/04ConsumerEducation/NegativeBR/d'adamo.html
