Shirley Robin Letwin writes and lec-tures on political philosophy. Apart from her books, she has published numerous essays in scholarly journals .and has contributed political commentaries to periodicals and newspapers. She has taught at Cambridge University, the London School of Economics, Harvard, Bran-dels, Cornell, and the University of Chicago. She has been a Guggenheim Fellow and a Fellow of the Radcliffe Institute. She is currently President of the Instltut International de Philosphie Politlque.