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) Galaxy Formation & Evolu (1) GRBs (1) High-Energy Pheno (1) Supernovae (1) (-) Exopla (1) (-) Heliophy (1) State AL (2) CA (4) GA (1) IA (1) MA (2) MD (4) NC (1) NM (3) NV (1) OR (2) PA (2) TX (2) (-) NY (2) Facet State City New York (1) Facet City Membership Class Full Member (2) Facet Membership Class Division DPS (11) DDA (6) SPD (5) HAD (4) HEAD (2) (-) LAD (2) Facet Division Showing 1-2 of 2 results Michael Hahn Full Member Affiliation Columbia University State/Province NY Country United States Dmitry Ivanov Full Member Affiliation Columbia University State/Province NY Country United States