December 11, 1948.
Dean Aure “, Sevringhaus,

College of Physicians & Surgecns,
New York 32, N.Y.

Dear Jean Sevringhaus,

I an writing to you at the request of lf. orton Zinder who is applyiag
for admission to the 1949 First Year class in the idedical School.

Mr. Zinder has been a student working in my laboratory since Jujy 1948.
During this time, he has been pursuing a research progran oa the Salnonslle
group of bacteria in igtiaate association with as. I have found him to be
highly intelligent, industrious and cooperative.

When he first came to Wisconsin, Mr. Zinder displayed certain signs of
Amaturity in his conversation, appearance ail iasnner. During this year, how
ever, he has showed considerable progress, and in ny judgzent is ready to
begin medical work in a way that he probably was not a year or two years ago.
i. Zinder's acadentc record speaks for itself; he would undoubtedly be an
asset to his class. We will be sorry to lose him to medical school, but he
was taken on hsre on the understanting that he might leave for this reason.

With sincerest personal regards,

Yours,

Joshua Lederberg,
‘Assistant Professor of Genetics,