According to Wikipedia:
Edward Jean Steichen (March 27, 1879 – March 25, 1973) was a Luxembourgish American photographer, painter, and art gallery and museum curator.
Steichen was the most frequently featured photographer in Alfred Stieglitz’ groundbreaking magazine Camera Work during its run from 1903 to 1917. Together Stieglitz and Steichen opened the Little Galleries of the Photo-Secession, which eventually became known as 291 after its address.
Text continues here.