Harris Louis Mayer (February 15, 1921 – September 17, 2023) was an American physicist known for his collaboration with Edward Teller and John von Neumann.
Edward Teller invited Maria Goeppert-Mayer and two of her students (Boris Jacobsohn and Harris Mayer) to the Los Alamos National Laboratory.
The bomb was not a part of the main mission of the Los Alamos Lab, but volunteers among the scientists became involved.
Mayer wrote a history of the lab in this era where he describes his contribution as the calculations of the equations of state and radiative transfer opacities.
However, these averages generalize many one-electron transitions that can take place in a large number of atomic bound electron configurations.
A bonus of Harris' participation was that his father was a distributor of liquor, and had access to more alcohol than was generally available due to rations during World War II.