Alan Shapley, son of astronomer Harlow Shapley, was born in Pasadena, California in 1919. The family moved to Cambridge, Massachusetts two years later. In this interview, Mr. Shapley shares recollections of his father and other astronomers, including Donald Menzel. He also discusses his own work on radio propagation at the Carnegie Institution’s Department of Terrestrial Magnetism and on solar-terrestrial phenomena at the National Bureau of Standards. As a major figure in the International Geophysical Year (IGY) of 1957–1958, Mr. Shapley headed up the coordination of World Days, when intensive measurements would be taken. His memories of the IGY are included here.