UNIVERSITY OF ILLINOIS DEPARTMENT OF BACTERIOLOGY 362 NOYES LABORATORY OF CHEMISTRY URBANA April 7, 1952 Dr. J. Lederberg Department of Genetics University of Wisconsin Madison, Wisconsin Dear Josh: Boris Rotman whom you may know briefly is going to apply for a postdoctorate fellowship and he would very mich like to spend it in your laboratory. He is a very gifted person who has a very good background in chemistry as well as in microbiology. He could prove to be helpful in many ways and I know he would greatly benefit from contact with your ideas and approaches, Please let me know as soon as you can whether you have the space and inclination to accept him.. If the thing goes through, he would be ready to start in the fall. Sincerely yours, sek S. Spiegelman °