Who was the photographer who became dissatisfied with pictorialism?

Alfred Stieglitz was the photographer who became dissatisfied with pictorialism. He was a key figure in the development of modern Photography and believed that photography should capture the essence of reality rather than imitate painting. Stieglitz championed straight photography, emphasizing clarity and detail, which led to a significant shift in the perception of photography as an art form. His work and advocacy helped establish photography as a legitimate medium for artistic expression.