Member Directory The AAS maintains a membership directory to facilitate member interaction and to support the conduct of official Society business. Search directory for: Filter Results By Clear Filters Type of Science Star Formation & Evolu (5) Exopla (4) Astronomy Educa (3) Galaxy Formation & Evolu (3) Active Galactic Nu (2) Astrobio (2) GRBs (2) High-Energy Pheno (2) Interstellar Me (2) Solar System/Planetary Sci (2) Supernovae (2) Cosmo (1) Galactic Structure & Stellar Populat (1) (-) Heliophy (1) State (-) NY (1) Facet State City Iowa City (1) Mohegan Lake (1) Staten Island (1) (-) New York (1) Facet City Membership Class (-) Full Member (1) Facet Membership Class Division LAD (1) SPD (1) Facet Division Showing 1-1 of 1 results Michael Hahn Full Member Affiliation Columbia University State/Province NY Country United States