Ōyama Iwao
Ōyama was born on October 6, 1917, the second son of Duke Kashiwa Ōyama, who was the second son of Ōyama Iwao. He graduated from the Department of Zoology, Tokyo Imperial University in 1941, and in the following year took up an assistant position in the Natural Resources Institute (資源化学研究所) of the Interior Ministry.