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Margaret J. Geller is an American astronomer and professor. She is a Senior Astronomer at the...

Margaret J. Geller is an American astronomer and professor. She is a Senior Astronomer at the Smithsonian Astrophysical Observatory, and has written numerous articles and produced several award-winning scientific short films. She is interested in mapping the distribution of the mysterious, ubiquitous dark matter in the universe, the halo of our own galaxy, the Milky Way, to understand the link between the history of our Galaxy and the history of the universe, mapping clusters of galaxies to understand how these systems develop over the history of the universe, and measuring and interpreting the signatures of star formation in the spectra of galaxies to understand the links between the star formation in galaxies and their environment. She leads a program called SHELS. In 1989, she discovered the Great Wall with John Huchra based on redshift survey data from the CfA Redshift Survey. In 2008 Geller was awarded the Magellanic Premium by the American Philosophical Society for her research into the groupings of galaxies.