Origins & Early Life

Leslie Richard Groves Jr. (17 August 1896 – 13 July 1970) was a United States Army Corps of Engineers officer who oversaw the construction of the Pentagon and directed the Manhattan Project, the top secret research program that developed the atomic bomb during World War II, leading to the atomic bombings of Hiroshima and Nagasaki in 1945. The son of a U.S. Army chaplain, Groves lived at various Army posts during his childhood.

Pivotal Works & Achievements

In 1918, he graduated fourth in his class at the United States Military Academy at West Point and was commissioned into the United States Army Corps of Engineers. In 1929, he went to Nicaragua as part of an expedition to conduct a survey for the Inter-Oceanic Nicaragua Canal. Following the 1931 Nicaraguan earthquake, Groves took over Managua's water supply system, for which he was awarded the Nicaraguan Presidential Medal of Merit. He attended the Command and General Staff School at Fort Leavenworth, Kansas, in 1935 and 1936, and the Army War College in 1938 and 1939, after which he was posted to the War Department General Staff. Groves developed "a reputation as a doer, a driver, and a stickler for duty".

Enduring Legacy & Impact

In 1940 he became special assistant for construction to...

Contemporary Figures & Related Historical Timelines

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