East 66th and East 67th Streets. 20th century Now called Mount Sinai Hospital, the institution forged relationships with many physicians who made contributions to medicine, including Henry N. Heineman, Frederick S. Mandelbaum, Bernard Sachs, Charles A. Elsberg, Emanuel Libman, and, most significantly, Abraham Jacobi, known as the father of American pediatrics and a champion of construction at the hospital's new site on Manhattan's Upper East Side in 1904. The hospital established a school of nursing in 1881. Created by Alma deLeon Hendricks and a small group of women, Mount Sinai Hospital Training School for Nurses was taken over by the hospital in 1895. In 1923, its name was changed to Mount Sinai Hospital School of Nursing. This school closed in 1971 after graduating 4,700 nurses—all women, except one man in the last class. An active alumnae association continues. The early 20th century saw the population of New York City explode. That, coupled with many new discoveries at Mount Sinai (including significant advances in blood transfusions and the first endotracheal anesthesia apparatus), meant that Mount Sinai's pool of doctors and experts was in increasing demand. A $1.35 million ($ in current dollar terms) expansion of the 1904 hospital site raced to keep pace with demand. The opening of the new buildings was delayed by the advent of World War I. Mount Sinai responded to a request from the United States Army Medical Corps with the creation of Base Hospital No.3. This unit went to France in early 1918, and treated 9,127 patients with 172 deaths: 54 surgical and 118 medical, the latter due mainly to influenza and pneumonia. World War II Two decades later, with tensions in Europe escalating, a committee dedicated to finding placements for doctors fleeing Nazi Germany was founded in 1933. With the help of the National Committee for the Resettlement of Foreign Physicians, Mount Sinai Hospital became a new home for a large number of émigrés. When World War II broke out, Mount Sinai was the first hospital to throw open its doors to Red Cross nurses' aides; the hospital trained many in its effort to reduce the nursing shortage in the States. Meanwhile, the president of the medical board, George Baehr, M.D., was called by President Roosevelt to serve as the nation's chief medical director of the Office of Civilian Defense. These wartime roles were eclipsed, however, when the men and women of Mount Sinai's 3rd