長崎大学
Yamashita graduated from the faculty of medicine at Nagasaki University in 1978. He finished a doctoral course at the graduate school of the same university in 1984. With the support of Dr. Shigenobu Nagataki, he studied at Cedars-Sinai Medical Center at UCLA in the United States from 1984 to 1987. After going back to Japan, Yamashita worked under Dr. Nagataki. He earned a doctoral degree in medicine in 1989 and was installed as a professor of the faculty of medicine at Nagasaki University in the following year. Later, he was installed as a president of the Nagai Takashi Memorial International Hibakusha Medical Center.