January 15, 1965 Dr. Kenneth Thimann Blological Laboratories Harvard University Cambridge 38, Massachusetts Dear Kenneth: Sunday's papers carried an announcement of your appointment at Santa Cruz, which I think deserves congratulations on all sides. I can remember your urging me to come East, and hope you will now learn the basis of my own enthusiasms in the other direction. But 1@ my own experience can be any basis don't expect to be able to relax in the West! There is still a pioneering approach to almost every aspect of living in California; but I am sure you would prefer constant challenge to complacency. In any event, we welcome your coming, look forward to seeing you, and offer all best wishes on the successful development of an exciting program. Sincerely yours, Joshua Lederberg Professor of Genetics Vil | fa i 4 “Al