Alfred Stieglitz revolutionized American photography in the early 20th century. As a photographer, gallerist, and art promoter, he championed photography as a fine art, equal to painting and sculpture. His work and advocacy transformed the medium's status and influenced generations of artists. Stieglitz founded the Photo-Secession movement and opened the influential 291 gallery in New York. He introduced modern European art to American audiences and supported emerging American artists. His own photographs, like "The Steerage" and the "Equivalents" series, remain iconic examples of modernist photography.