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 (3) Galaxy Formation & Evolu (2) GRBs (2) High-Energy Pheno (2) Supernovae (2) Interstellar Me (1) (-) Astronomy Educa (1) State NY (1) Facet State City Acton (1) Alexandria (1) Ames (1) Austin (1) Baltimore (3) Berkeley (2) Bloomington (1) Boston (1) Bothell (2) Cambridge (17) Chicago (1) College Station (1) Daejeon (1) Derwood (1) Ellicott City (1) Eugene (1) Ewing (1) Fort Myers (1) Garching (1) Grafton (1) Grand Forks (1) Hanover (1) Huntingdon (1) Huntsville (1) Hyattsville (1) Iowa City (1) Johnson City (1) Knoxville (1) La Jolla (1) Los Alamos (1) Los Angeles (1) Madison (2) Manly (1) Melbourne (1) Middlebury (1) Middletown (1) Missouri City (1) Muncie (1) Newark (3) New London (1) North Dartmouth (1) Orangevale (1) Oxford (1) Pasadena (4) Pomona (1) Prague (1) Prescott (2) Reading (1) Redmond (1) Reno (1) Salt Lake City (2) Santa Cruz (1) Santa Fe (1) Scaggsville (1) Seattle (1) Severna Park (1) Stanford (1) Tempe (2) Urbana (1) Washington (3) Winnipeg (1) Winthrop (1) Woodside (1) (-) New York (1) Facet City Membership Class Full Member (1) Facet Membership Class Division DDA (2) DPS (1) HAD (1) LAD (1) (-) HEAD (1) Facet Division Showing 1-1 of 1 results David Helfand Full Member Affiliation Columbia University State/Province NY Country United States