Henry Norris Russell

Henry Norris Russell was an American astronomer who, along with Ejnar Hertzsprung, developed the HertzsprungRussell diagram . In 1923, working with Frederick Saunders, he developed RussellSaunders coupling which is also known as LS coupling.

Russell was born in 1877 in Oyster Bay, New York. He studied astronomy at Princeton University, obtaining his B.A. In 1897 and his doctorate in 1899, studying under Charles Augustus Young. From 1903 to 1905, he worked at the Cambridge Observatory with Arthur Robert Hinks as a research assistant of the Carnegie Institution and came under the strong influence of George Darwin.

Source: Wikipedia