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Lieutenant General Leslie Richard Groves (August 17, 1896 – July 13, 1970) was a United States Army officer who oversaw the construction of the Pentagon and was the primary military leader in charge of the Manhattan Project to develop the atomic bomb during World War II.

Contents 1 Biography 1.1 Manhattan Project 1.2 Post-retirement 2 Popular culture depictions 3 Footnotes 4 External links

Descended from French Huguenots who came to America in the 17th century, Leslie Groves was the son of a U.S. Army chaplain. He was born in Albany, New York, and educated at the University of Washington and MIT before attending West Point. Groves graduated in 1918, fourth in his class, and was commissioned into the Army Corps of Engineers, completing his engineering studies at Camp A. A. Humphreys (now Fort Belvoir), 1918–21. He married Grace Hulbert Wilson in 1922.

Groves worked in various assignments throughout the United States and served with distinction in Nicaragua. He was attached to the Office of the Chief of Engineers and received a promotion to Captain in October 1934, and, following courses at the General Staff College at Fort Leavenworth (1936) and the Army War College (1939), he was promoted to Major in 1940 and posted to the General Staff in Washington. He was deputy to the Chief of Construction and oversaw a number of projects including the construction of the Pentagon in 1940. In the same year, he was promoted to Colonel.

By this time Groves had developed a reputation as an officer of high intelligence, tremendous drive and energy, and great organizational and administrative ability, as well as considerable ruthlessness, arrogance, and self-confidence. His success in overseeing a huge number of construction projects costing billions of dollars during the mobilization period between 1940 and 1942 made him a natural choice to take charge of the fledgling atomic bomb program.

In September 1942, he was made temporary Brigadier General and appointed as the military director of the nascent Manhattan Engineer District of the US Army Corps of Engineers, replacing the first director, Col. James Marshall, who had proven indecisive and slow in getting the project moving beyond the research stage. He provided the code-name 'Manhattan' himself from the Corps practice of naming districts after their headquarters' city. He had been seeking action overseas and was initially highly dubious of attaching himself to a highly controversial weapons project. Nevertheless he quickly threw himself into the project with every ounce of energy he possessed.

Groves was important in most aspects of the bomb's development, including determining the sites to be used, finally deciding on Oak Ridge, Tennessee, Los Alamos, New Mexico and Hanford Engineering in Washington state, as the primary sites for theoretical research and materials production. See Los Alamos National Laboratory for a detailed examination of the project. He made critical decisions on prioritizing the various methods of isotope separation, acquiring raw materials needed by the scientists and engineers, and in creating the army air force bomber unit which would deliver the finished bombs to their targets. He strongly advocated the choice of Kyoto as lead target, citing its tremendous cultural importance; he reasoned that the city's highly educated population would better appreciate the significance of the new weapon, thereby increasing its political impact. His wish to destroy the city was overruled by Secretary of War Henry Stimson, who had honeymooned there. He was involved in collecting intelligence on German atomic research and helped determine which cities in Japan were chosen as targets. Groves also blanketed the Manhattan Project with an unprecedented degree of security, which, however, failed to prevent the Soviets from conducting a successful espionage program which stole some of its most important secrets.

Though his conservative, rigid temperament and cold, blunt manner alienated some of the scientists he worked with, he also took the risky step of putting (against the advice of everyone he consulted) J. Robert Oppenheimer (a leftist intellectual and Groves' opposite in almost everything) in charge of Los Alamos, where the bomb was designed and assembled, trusting in the physicist's abilities. Groves' choice proved inspired, for Oppenheimer's brilliant, charismatic leadership was decisive in creating workable designs and getting them transformed into usable bombs.

Groves' greatest contribution to the Manhattan Project was in imparting his own driving energy and determination to get the bomb built as quickly as possible to the program in general. He was the key leader in transforming what had been a slow paced, poorly coordinated, theoretical and laboratory research effort of a few universities into a fast moving, highly articulated, truly massive juggernaut involving thousands of scientists, engineers, technicians, workmen, and soldiers, as well as hundreds of companies and governmental organizations, spread all over the United States and indeed the world.

Some activists believe, incorrectly, that Groves was one of the early proponents of using depleted uranium. A memo alleged to be on that subject, is often cited on the Internet. However, a close reading of the memo, which is actually a composite of several documents, including some pages not attributable to Groves, shows that the material under discussion was fission products and not uranium.

Groves was promoted to temporary Major General in 1944. After the atomic bombing of Hiroshima and Nagasaki ended the war with Japan, Groves was awarded the Distinguished Service Medal.

As chief of the atom bomb program during the wartime emergency, Groves accrued an enormous amount of power. In the words of a subordinate, he, "...planned the project, ran his own construction, his own science, his own Army, his own State Department and his own Treasury Department." Doing so, Groves ran roughshod over many people and made many enemies, some of them quite powerful. These enemies eventually succeeded in drastically reducing Groves' power and authority as control over atomic energy was transferred from military to civilian hands (from the Manhattan District to the Atomic Energy Commission) in January, 1947.

For a time, Groves continued to play a role at Los Alamos as head of the Armed Forces Special Weapons Project, but he eventually realized that in the rapidly shrinking post-war Army he would not be given any assignment approaching in importance the one he had held in the Manhattan Project (such posts would go to combat commanders returning from overseas). He decided to leave the Army, though he was made Lieutenant General in recognition of his leadership of the bomb program, just before his retirement on February 29, 1948.

Groves went on to become a Vice-President at Sperry Rand. He moved to Darien, Connecticut in 1948.^[1] He retired from Sperry Rand in 1961 and moved back to Washington, D.C. He also served as president of the West Point alumni organization, the Association of Graduates. He presented Douglas MacArthur the Sylvanus Thayer Award on the occasion of MacArthur's famous Duty, Honor, Country speech to the Corps of Cadets in 1962. His account of the Manhattan Project, NOW IT CAN BE TOLD, was originally published in 1962.^[2]

In 1955, a reporter asked Groves how the secret of the atomic bomb was "so well kept," (apparently forgetting that it wasn't well kept from the Soviets) and recorded this reaction: "If you have ever been the object of his direct look, you will know why I dropped my pencil in utter confusion when he said, 'Mainly by not talking to reporters.'" The reporter laughed, Groves laughed and the interview went on.^[1]

He is memorialized as the namesake of Leslie Groves Park along the Columbia River, not more than five miles from the Hanford Site in Richland.

Groves' role in the Manhattan Project has attracted a continuing interest in film. He was a character played by Paul Newman in Fat Man and Little Boy, by Richard Masur in the 1995 docudrama Hiroshima, by Richard Herd in the 1980 television movie Enola Gay, and by Brian Dennehy (physically much closer to Groves than was Newman) in a three-hour 1989 PBS television production, DAY ONE: Before Hiroshima and After.

In fiction, Groves is a key figure in Harry Turtledove's alternate history series Worldwar.

In John Adams's opera Doctor Atomic, Groves is a lead character of the opera.

• Annotated bibliography for Leslie Groves from the Alsos Digital Library for Nuclear Issues

Persondata
NAME	Groves, Leslie Richard
ALTERNATIVE NAMES
SHORT DESCRIPTION	Military leader of the Manhattan Project
DATE OF BIRTH	August 17, 1896
PLACE OF BIRTH	Albany, New York
DATE OF DEATH	July 13, 1970
PLACE OF DEATH