From Computer Pioneers:
In April 1946 he accepted an invitation from John von Neumann and Herman Goldstine to join the newly organized Electronic Computer Project at the Institute for Advanced Study in Princeton, New Jersey. This project was to build a parallel stored-program computer that would be the prototype for a number of machines such as the MANIAC, ORACLE, ILLIAC, AVIDAC, and so on. Pomerene designed the adder portion of the arithmetic unit and then was entirely responsible for the development and construction of the electrostatic (Williams tube) memory. In August 1951 he was appointed chief engineer of the project, a position he held until the project was disbanded in 1956.
Lee, J.A.N. "James (Jim) H. Pomerene," (1995)