Frank Plumpton Ramsey (1903--1930), Cambridge mathematician and philosopher, was one of the most brilliant people of his generation. He lived in an extraordinarily stimulating milieu, surrounded by figures such as Russell, Whitehead, Keynes, Moore, and Wittgenstein. Ramsey's highly original papers on the foundations of mathematics, probability, economics, philosophy of science and the theory of knowledge were very influential in the 20th century and are still widely discussed in the 21st. This collection of eleven new papers, specially written to commemorate his centenary, answers a crying need for more secondary literature on Frank Ramsey. Nearly all the aspects of Ramsey's work are examined: his logic, philosophy of mind, philosophy of science, metaphysics, epistemology, pragmatism, economics, and the mutual influences between Ramsey and Wittgenstein. The book will be eagerly welcomed by those working in many branches of analytic philosophy, and beyond.