 He was a member of the Hubble Space Telescope Advanced Camera for Surveys investigation team and project scientist for the STScI Digitized Sky Survey program.He has also served on the Council of the American Astronomical Society and on the Committee for the Status of Women in Astronomy.Postman is also the Principal Investigator of the HST multi-cycle treasury program Cluster Lensing and Supernova survey with Hubble, a study of dark matter in clusters of galaxies.