The notable scientist known for her contributions to the study of DNA is Rosalind Franklin. While working in the mid-20th century, Franklin used X-ray crystallography to capture images of DNA, leading to critical insights into its double-helix structure. Her famous photo, known as Photo 51, played an essential role in the discovery of the DNA structure by scientists James Watson and Francis Crick. Despite her contributions being overlooked initially, Franklin’s research is now recognized as pivotal in understanding genetics and molecular biology.