The tragic loss caused by the premature death of Abraham Robinson brought about a deeply felt desire by his close friends, colleagues, and pupils to commemorate his exceptional gifts and personality. An appropriate way to accomplish this appeared to be the selection and editing of his writings on applied mathematics, mathematics, mathematical logic, philosophy, and nonstandard analysis, and the publication of these papers in these volumes.This edition presents only an incomplete picture of Robinson’s work and influence on mathematics and mathematical logic. It is impossible to do full justice to his many lectures, his philosophical and expository articles, and his many contributions to the work of his pupils. We do feel, however, that the present selection, together with his many important books and monographs, will show the mark his work has left on the development of mathematics and mathematical logic in this century.