Francis Graham-Smith is Emeritus Professor of Radio Astronomy at the University of Manchester. He is a pioneer of radio astronomy and was involved in the discovery and accurate location of discrete radio sources. He has been Director of the Royal Greenwich Observatory, Physical Secretary of the Royal Society, Director of the Jodrell Bank Observatory and Astronomer Royal 1982-1990. The fourth Edition of Pulsar Astronomy is the product of over 40 years of close collaboration in research at Jodrell Bank Observatory.