Albert Einstein died as the result of a ruptured abdominal aortic aneurysm on April 18, 1955 at the age of 76. He had been hospitalized with internal bleeding for which he refused treatment, wanting to die in his own time and on his own terms.
This German-born physicist and Nobel Prize winner left a legacy of scientific work at his death. His equation, energy equals mass multiplied by the speed of light squared, was only the beginning of his work, which later grew into the development of a general theory of relativity that made him famous. Einstein moved to the United States after Hitler took over Germany, and it was he who warned President Roosevelt of the possibility of the Nazis developing an atomic bomb. This move, at least in part, led to the establishment of the Manhattan Project. According to Biography, when Einstein became ill with the aneurysm, he stated, "I have done my share, it is time to go. I will do it elegantly."