April 20, 1950.
Dear Mr. Machaver:
Mr. Herbert Dorfman was not actually a student in any of my classes, and I know him only as a general assistant and dishwasher in my laboratory, which is primarily concerned with bacteriological research.  However, what knowledge I have of him is quite commendable.
I found him to be a careful worker, quite diligent- even eager for work.  He seems to be intelligent and very affable.  He was rapidly developing competence in bacteriological techniques.
I am sorry not to be able to tell you of his academic qualifications but I simply have no knowledge of them.  In every other respect, however, I am pleased to recommend him without reservation.
Yours sincerely,
Joshua Lederberg
Assistant Professor of Genetics