Each document appears in the "Collected Papers" of Albert Einstein in the language in which it is written, and the supplementary paper folders provide English translations if all non-English materials. For those who wish to supplement Volume 5, for example, this paperback includes translations of correspondence that give a richer picture of Einstein in his twenties and thirties.

In addition to shedding light on the personal aspects of his life, the letters document his scientific activity: his concentration for years on unexplained problems of quantum and radiation, his extensive knowledge of experimental physics, his fruitful interactions with the experimentalists, and his long struggle to generalize the theory of relativity in 1905 to include gravity and the accelerated reference frame. This paper-based translation does not include notes or annotations of documentary size and is not intended to be used without the original version of the documents in the language, which provides the broad editorial commentary necessary for full historical and scientific understanding of the documents..

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