Dorothea Lange was a pioneering photojournalist who documented the Great Depression in the United States. She began her career in portrait photography but shifted her focus to documenting the struggles of migrant workers and families during the economic crisis of the 1930s. Her most famous photograph, "Migrant Mother," captured a mother's desperation and became a powerful symbol of the hardship many faced at the time. Throughout her career, Lange aimed to sensitively share the human experiences of her subjects and raise awareness of social issues through compelling photography.