The NATO Advanced Study Institute 'The Many Faces of Neutron Stars' was the fourth in a series focusing on the astrophysics of neutron stars, which started with the ASI 'Timing Neutron Stars' (Qeme, Turkey, April 1988), and as followed by 'Neutron Stars, and Interdisciplinary Field' (Agia Pelagia, Greece, September 1990), and 'The Lives ofthe Neutron Stars' (Kemer, Turkey, Septem- ber 1993). The first ASI had as its theme the main types of observations from which we infer the properties of neutron stars, i.e., the timing of radio pulsars and accret- ing neutron stars in X-ray binaries. The...