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 (8) Exopla (6) Astronomy Educa (4) Galaxy Formation & Evolu (4) GRBs (4) High-Energy Pheno (4) Supernovae (4) Active Galactic Nu (3) Solar System/Planetary Sci (3) Astrobio (2) Cosmo (2) Galactic Structure & Stellar Populat (2) Interstellar Me (2) (-) Heliophy (1) State (-) NY (1) Facet State City Geneseo (1) Lockport (1) Mohegan Lake (1) Rochester (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