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 Active Galactic Nu (1) Astronomy Educa (1) Star Formation & Evolu (1) (-) Heliophy (1) State (-) NY (1) Facet State City (-) New York (1) Facet City Membership Class Full Member (1) Facet Membership Class Division SPD (1) (-) LAD (1) Facet Division Showing 1-1 of 1 results Michael Hahn Full Member Affiliation Columbia University State/Province NY Country United States