Warren Moos graduated from Brown University in 1957 and received a PhD in physics from the University of Michigan in 1962. From 1961 to 1963, he was a postdoctoral researcher at Stanford University, becoming an acting assistant professor in 1963. He joined the Department of Physics and Astronomy at Johns Hopkins in 1964, where he has served as director of the Center for Astrophysical Sciences and as chair of the Department of Physics and Astronomy. In this oral history, Moos discusses major projects and programs during his career at Johns Hopkins University. This oral history is part of the Hopkins Retrospective oral histories series.