Having set up the laboratory that I was hired to prepare, and after several months having it running properly, I learned from Hilary that he was looking for someone who was skilled in cytogenetics. At this time we now understood clearly that humans didn't have 48 chromosomes, they had a mere 46. And consequently that gave rise to a whole new field of what we call cytogenetics, that is looking for chromosome anomalies, that is if you can stain and look at the chromosomes individually and determine whether parts of them are missing, and that became possible very quickly, that you could trace those changes to several kinds of human pathologies. It is now a huge field, but at that time it was in its embryonic stages. And for... because of the relationship between cell culture and virology, which as I said earlier at that time gave birth to the subsequent 10 years of the golden age of virology, when the virologists and cell culturist married and gave forth all of the modern vaccines that we have today, virtually all of them.

As a consequence of Hilary's interest in hiring someone with that kind of background I suggested that he contact Paul Moorhead who was still at Charlie Pomerat's lab in Texas, he did, and the result was that he hired Paul, and Paul established a lab at Wistar which later became very important for my work, my subsequent work.