So it was now necessary for me to move on, look for another job, and I sent letters to former professors and friends in Philadelphia and others. One of the letters fortunately was sent to a former teacher of mine who I really well respected, liked very much, his name was Warner Henley. Warner was a world renowned virologist as was his wife. They worked at Children's Hospital in Philadelphia. And it was at this time that the Wistar Institute underwent a major change. It was decided by a committee I believe composed from some people from Pen and others, that they should look for a permanent director of the entire institute and set a policy for research activities there that would somehow be more structured than what had existed heretofore.

They hired Hilary Koprowski, an internationally known and respected virologist, who was a Polish ex-patriot. And Hilary came to the Wistar Institute, not from Poland, because he had migrated from Poland to South America where... and then from South America to New York State where he worked for a major pharmaceutical company, and it was at that company that he left in order to become director of the Wistar Institute. And this, of course, was all well known to Warner Henley who suggested to Hilary Kaprowski that because Hilary was interested in establishing a cell culture unit at the Wistar Institute that he might get in touch with me.