Woo Jang-choon (April 8, 1898 – August 10, 1959) was a Korean-Japanese agricultural scientist and botanist, famous for his discoveries in the genetics and breeding of plants.Woo was born and raised in Japan, overcoming poverty and discrimination in Imperial Japan to become a prominent researcher and teacher.
When Korea was freed of Japanese rule in 1945, Woo left his family in Japan and traveled to Korea to lead the country's efforts in botany and agriculture.
There is a memorial museum in the port city of Busan where he lived and worked in Korea, honoring his life and accomplishments.Woo is credited in scientific literature as Nagaharu U, a Japanese reading of the Chinese characters of his Korean name (the pronunciation of his family name ? can be Romanised as U in both Japanese (?) and Korean (?)).