Dalitz joined Peierls at Birmingham in 1949 and soon became one of his closest friends and colleagues. After a period at the Enrico Fermi Institute in Chicago 1956-1963, Dalitz returned to Oxford as a Royal Society Research Professor in 1963. See Bird of Passage, pp. 234, 291.

Many of Dalitz's letters are closely written in fine longhand, sometimes in pencil; the year is often omitted from the date and the documents have been assigned from the context.

Correspondence from Dalitz in Chicago, relating to a wide range of topics, scientific, departmental and personal.