Pilger's career in journalism began in 1958, and he has developed his reputation through both his reporting and the various books and documentary films that he has written or produced. He is best known in Britain for his investigative documentaries, particularly those on Cambodia and East Timor. He has acted as a war correspondant during conflicts in Vietnam, Cambodia, Egypt, India, Bangladesh and Biafra. In all of his work, Pilger has been a prominent and fervent critic of Western foreign policy. He is particularly opposed to many aspects of American foreign policy which he regards as being driven by a largely imperialist agenda. Many Americans and those with pro-American sentiments have interpreted this as simple anti-Americanism on his part.