作为1942年至1945年曼哈顿计划的成员，Szilard在芝加哥大学与费米一起担任首席物理学家，在那里他们建造了世界上第一个工作的核反应堆。这一突破导致了1945年7月16日在新墨西哥州白沙市首次成功测试原子弹。西兹拉德受到他帮助制造的武器的破坏性力量的震动，决定将余生献给核安全，军备控制和防止军事目的进一步发展核能。第二次世界大战后，Szilard对分子生物学以及Jonas Salk在开发脊髓灰质炎疫苗方面所做的开创性研究着迷，最终帮助建立了Salk生物研究所。在冷战期间，他继续呼吁国际原子武器控制，和平利用核能的进步，以及美国与苏联的良好关系。西拉德于1959年获得了原子用于和平奖，并被美国人文主义者协会评为年度人文主义者，并于1960年获得阿尔伯特爱因斯坦奖。1962年，他成立了一个致力于提供“宜居世界”的组织。 “向国会，白宫和美国公众提供关于核武器的理性的甜美声音”。
英国诺丁汉大学教育Assignment代写：阿尔伯特爱因斯坦奖
As a member of the Manhattan Project from 1942 to 1945, Szilard worked as a chief physicist with Fermi at the University of Chicago, where they built the world’s first nuclear reactor. This breakthrough led to the first successful test of the atomic bomb in Baisha, New Mexico, on July 16, 1945. Szild was shaken by the destructive power of the weapons he helped to make, deciding to dedicate the rest of his life to nuclear safety, arms control and prevention of military purposes to further develop nuclear energy. After the Second World War, Szilard was fascinated by molecular biology and Jonas Salk’s groundbreaking research in developing polio vaccines, which ultimately helped establish the Salk Institute of Biology. During the Cold War, he continued to call for international atomic weapons control, the peaceful use of nuclear energy, and the good relations between the United States and the Soviet Union. Silad won the atom for the Peace Prize in 1959, was named the Humanist of the Year by the American Literati Association, and won the Albert Einstein Prize in 1960. In 1962 he established an organization dedicated to providing a “livable world.” “Providing a rational sweet voice about nuclear weapons to Congress, the White House and the American public.”