Maria Mitchell (1818-1889) was an American astronomer. She began her career as an amateur, making observations from her home in Nantucket. In 1847 she discovered a comet, winning an international prize, and became a minor celebrity.[1] This launched her on her professional career. She worked on calculations for the American Ephemeris and Nautical Almanac. In 1865, Matthew Vassar founded Vassar College and hired her as a professor of astronomy and director of the observatory. The observatory was the first building constructed at Vassar.[2] Vassar became an important center of astronomy, and Vassar graduates were in demand by the large observatories.[3]