Ann Hornschemeier

Ann Hornschemeier is an American astronomer specializing in X-ray emission from X-ray binary populations. She is the Chief Scientist for the Physics of the Cosmos program at NASA. At NASA, Hornschemeier researches high energy astrophysics and cosmology.

Hornschemeier specializes in studies of x-ray emission from x-ray binary populations, both in the local universe and at cosmologically interesting distances (z > 0.1). This work is carried out using surveys by space-based x-ray, UV and infrared observatories, alongside ground-based telescopes. She is also the Chief Scientist for the Physics of the Cosmos (PCOS) programme, from Pennsylvania State University; she has a Master of Science in astronomy in Astrophysics NASA awarded her the Early Career Achievement Medal in 2012, recognising outstanding early career achievement in science, leadership and service. In 2016, she was elected Fellow of the American Physical Society.

Family Hornschemeier's brother is the artist, author, and director Paul Hornschemeier.