The career of Irwin I. Shapiro is fully documented in this accession and includes incoming and outgoing correspondence (including letters of recommendation), notes from meetings and telephone calls, and manuscripts and writings chronicling Shapiros research at Harvard and the Massachusetts Institute of Technology. Teaching materials in the accession include lecture notes, problem sets, quizzes and examinations, syllabi, readings, handouts, and curriculum development materials for courses Shapiro taught at Harvard, the Massachusetts Institute of Technology, Brandeis University, and Boston University. Subject and research files chronicle Shapiros involvement in several scientific projects including the Mariner, Viking, and Pioneer Venus-exploration spacecraft missions, near-Earth object surveys, and the development of radio astronomy and global navigation satellite systems. The accession includes Shapiros records as director of the Harvard-Smithsonian Center for Astrophysics including correspondence, email, memoranda, meeting minutes and notes. Professional activity files document Shapiros involvement with several professional organizations including the National Academy of Sciences Space Science Board, NASA Advisory Council, Northeast Radio Observatory Corporation, Science Advisory Committee, Steering Committee to Review Near-Earth Object Surveys and Harvard Mitigation Strategies. Biographical material includes notes taken by Shapiro as a graduate student at Harvard in the 1950s, membership certificates and awards, photographs, curriculum vitae, and bibliographies. The accession also includes grant proposals, travel files, and lectures given by Shapiro at conferences.