The project was a monumental collaboration between military organization and scientific research.

The "hard-driving" director of the project from the U.S. Army Corps of Engineers who oversaw all construction and security.

While not a project member, his 1939 letter to President Roosevelt warning of German nuclear potential served as the project’s initial catalyst. 2. Major Research and Production Sites

The brilliant theoretical physicist who served as the scientific director of the Los Alamos Laboratory, where the bombs were actually designed.

The Manhattan Project was the massive, top-secret U.S. government initiative during World War II that successfully developed the world’s first atomic weapons. Driven by the fear that Nazi Germany was developing nuclear technology, the project combined the efforts of the military, industry, and the world’s leading scientific minds to translate theoretical physics into a devastating reality. 1. Key Figures and Leadership

The project was spread across clandestine "secret cities" in the United States. The Manhattan Project - Department of Energy