James MacDonald The author received his PhD in Astronomy from Cambridge University in 1979. Following postdoctoral positions at the Universities of Sussex and Illinois and Arizona State University, he joined the University of Delaware in 1985 where he is now a Profesor of Physics and Astronomy. His scientific expertise is the study of the structure and evolution of stars. Recent work has focused on low mass main sequence stars and brown dwarfs. He has published over 80 papers in peer-reviewed journals. Read More Read Less