Masahiko Nomi was a Japanese

Japanese people

The are an ethnic group originating in the Japanese archipelago and are the predominant ethnic group of Japan. Worldwide, approximately 130 million people are of Japanese descent; of these, approximately 127 million are residents of Japan. People of Japanese ancestry who live in other countries...

 journalist who advocated Takeji Furukawa's idea of an influence of blood type on personality. He was also known as a sumo

Sumo

is a competitive full-contact sport where a wrestler attempts to force another wrestler out of a circular ring or to touch the ground with anything other than the soles of the feet. The sport originated in Japan, the only country where it is practiced professionally...

 essayist.

Nomi was born in Kanazawa, Ishikawa

Kanazawa, Ishikawa

is the capital city of Ishikawa Prefecture, Japan.-Geography, climate, and population:Kanazawa sits on the Sea of Japan, bordered by the Japan Alps, Hakusan National Park and Noto Peninsula National Park. The city sits between the Sai and Asano rivers. Its total area is 467.77 km².Kanazawa's...

 in 1925. He graduated from the engineering faculty of University of Tokyo

University of Tokyo

, abbreviated as , is a major research university located in Tokyo, Japan. The University has 10 faculties with a total of around 30,000 students, 2,100 of whom are foreign. Its five campuses are in Hongō, Komaba, Kashiwa, Shirokane and Nakano. It is considered to be the most prestigious university...

, and after the graduation he enrolled to the law faculty of the same university. During this time he started his career as a writer.

His first book on the subject, Ketsueki-gata de Wakaru Aisho (Understanding Affinity by Blood Type) became a best seller in 1971. He wrote more than ten popular books. After his death in 1981, his son, Toshitaka Nomi inherited the study.