 Within six years of receiving his Ph.D., Jamieson was an Associate Professor of cell biology at the Rockefeller University.This was a scientifically prolific time at the Rockefeller; in addition to George Palade, Jamieson was associated with Keith Porter, Philip Siekevitz, Christian DeDuve, and many other distinguished scientists.In 1973, Jamieson left the Rockefeller with Dr. Palade to assist in founding the Section of Cell Biology at the Yale School of Medicine.