Department of History at Yale University initially as a one-year visitor. He would remain at Yale for the rest of his life. Price gave a series of lectures in Yale in 1959, which formed the basis for a book, Science since Babylon (1961). In 1960, a Department of History of Science and Medicine was formed at Yale, largely through the efforts of John Fulton who had been Professor of the History of Medicine since 1951. Price became Professor of the History of Science, and on Fulton's death in 1960 became chairman of the department. In 1962 he became the Avalon Professor of the History of Science. The quantitative study of science, Scientometrics, and its application to science policy, became the principal focus of Price's work from the 1960s onwards. In 1963 his best-known book Little Science, Big Science was published. Early in that year, he met Eugene Garfield, founder of the Science Citation Index (SCI), and formed a lasting collaboration. SCI would provide most of the data for his quantitative work, allowing studies not just of the quantity of scientific publication, but, for example, of the impact of those publications, and of the duration of that impact. In 1965, Price gave the first Science of Science Foundation lecture, entitled The Scientific Foundations of Science Policy, given at the Royal Institution in London. He argued that as science grew exponentially it presented new challenges to policy-makers, and that they could be helped by the kind of Scientometric work he was carrying out and promoting. Clearly exponential growth cannot continue indefinitely, and the slowing of growth rates will correspond to pressing issues around allocation of resources. He also emphasised the critical importance of communication, referring to the "invisible college", a network of scientific communication that exists outside formal channels. The lecture was reviewed at length in the journal Nature. Price died of a heart attack at the home of his oldest friend, Anthony Michaelis, in London, during a visit to attend the wedding of his niece. He was survived by his wife, Ellen, and their three children, Linda, Jeffrey, and Mark. In 1984, Price received, posthumously, the ASIS Research Award for outstanding contributions in the field of information science. Since 1984, the Derek de Solla Price Memorial Medal is awarded by the International Society for Scientometrics and Informetrics to scientists with outstanding contributions to the fields of quantitative studies of science. Scientific