Nellie Bly was a groundbreaking journalist known for her investigative reporting. She gained prominence in the late 19th century for her exposé on the conditions of mental asylums, which she documented by going undercover as a patient. Bly's bold approach to journalism not only brought attention to social injustices but also revolutionized investigative reporting methods. Her work highlighted the importance of using journalism as a tool for social change and reform, earning her a legacy as a pioneer for women in the field.