Margaret Geller, American astrophysicist, astronomer, and academic
Margaret J. Geller (born December 8, 1947) is an American astrophysicist at the Harvard–Smithsonian Center for Astrophysics. Her work has included pioneering maps of the

nearby universe, studies of the relationship between galaxies and their environment, and the

development and application of methods for measuring the distribution of matter in the universe.