During WWII, Elda Anderson (1899-1961) worked on the Manhattan Project in the Office of Scientific Research and Development at Princeton University. In 1943, she was recruited from Princeton to work at Los Alamos National Laboratory. At Los Alamos, Anderson created the first sample of uranium-235 for testing and experimentation and served as a key player in the creation of the atomic bomb. After the war, Anderson worked to establish the field of health physics as a scientific discipline. She established the Health Physics Division at Oak Ridge National Laboratory in Tennessee, served as president of the Health Physics Society, and helped establish the American Board of Healthy Physics. She served as its chair until her death in 1961.