Plass received his Ph.D. from Princeton University in 1947 and worked as an associate physicist at the Metallurgical Laboratory (Manhattan District) of the University of Chicago from 1942 to 1945.

• 1947年他获得了普林斯顿大学的博士学位，1942年至1945年在芝加哥大学冶金实验室（曼哈顿特区）担任副研究员。