Noam Chomsky has held professorships in the Department of Linguistics and Philosophy at M.I.T. and in the Program in Environment and Social Justice at the University of Arizona. His work is widely credited with having revolutionized the field of modern linguistics, and he is equally renowned for his incisive writings on global affairs and U.S. foreign policy. Chomsky has written more than 100 books, including the bestselling political works Hegemony or Survival, Failed States, and Who Rules the World?.