It is a common misconception that Albert Einstein was part of the team of scientists that developed the world’s first atomic bombs. This in not true. Einstein never worked on the bomb, he was denied the security clearance in July of 1940 that he needed to be part of the Manhattan Project, those that were given clearance were forbidden to even consult Einstein because of his left-wing politics. He was deemed a national security risk.
The connection that Einstein had to the development of the bomb was the letter he wrote to President Roosevelt warning him that Nazi Germany scientists were working on an atomic weapon. Even his E=mc2 only explains the energy an atomic bomb releases; it does not provide any help in building one.