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 (3) Active Galactic Nu (2) Interstellar Me (2) Solar System/Planetary Sci (2) Astronomy Educa (1) Cosmo (1) Exopla (1) Galaxy Formation & Evolu (1) GRBs (1) High-Energy Pheno (1) Supernovae (1) (-) Heliophy (1) State AL (2) BC (1) CA (6) HI (1) IA (1) MA (1) MD (7) NC (1) NM (3) NV (1) OR (1) PA (3) SC (1) (-) NY (1) Facet State City New York (1) Facet City Membership Class Full Member (1) Facet Membership Class Division DPS (7) SPD (4) DDA (2) HAD (2) HEAD (1) (-) LAD (1) Facet Division Showing 1-1 of 1 results Michael Hahn Full Member Affiliation Columbia University State/Province NY Country United States