Impey was born in Edinburgh, Scotland, and spent his childhood mostly in New York and London, attending 11 schools. He got a 1st class honours BSc in Physics at Imperial College of Science and Technology, part of the University of London, in 1977. After an internship working on a neutrino calorimeter at CERN under Jack Steinberger, he went to the University of Edinburgh for graduate school in astronomy. He earned a PhD under the supervision of Peter Brand and Ray Wolstencroft in 1981.
He worked at the Institute for Astronomy at the University of Hawaiʻi from 1981 to 1983 as a UK Science Research Council/NATO Fellow, then at California Institute of Technology from 1983 to 1986 as a Weingart Fellow. Impey has been on the faculty of the Department of Astronomy/Steward Observatory at the University of Arizona since 1986, since 2000 as a University Distinguished Professor. He is Deputy Department Head in charge of academic programs, leading the nation's largest undergraduate astronomy majors program, its second largest astronomy PhD program, and one of the largest programs to teach astronomy to non-science majors.
He was a heavy early user of the Hubble Space Telescope, getting time in each of the first eight cycles of observation. At Steward Observatory in the 1990s, he studied the intergalactic medium using multiple quasars to probe the three dimensional structure of the hot, diffuse gas in galaxies,[6] which contains as many baryons as the sum of all the stars in the universe.[7] He also studied gravitational lensing using the exquisite image quality and stability of the HST.[8]
Over the past decade, he has been a major participant of the Cosmic Evolution Survey (COSMOS), led by Nick Scoville at Caltech. He led the spectroscopic follow-up of active galaxies and quasars selected by their X-ray emission, with a goal of charting the growth and fuelling rate of the massive black holes that are now known to exist in every galaxy.[9] Impey's research has been supported by over $20 million in grants from NASA and the National Science Foundation.
Education
Impey is a pioneer in the use of instructional technology in the classroom. He was the lead author of the University of Arizona plan for instructional computing in the 1990s and he gave the first invited education talk at an American Astronomical Society meeting. He has been on the editorial boards of the Astronomy Education Review and the Encyclopedia of the Cosmos, and served on the board of directors of the Astronomical Society of the Pacific. He is on the International Executive Committee of the Inspiration of Astronomical Phenomena series of meetings. He has written over 40 articles on education, pedagogy, and science literacy.
He is the winner of seven teaching awards at the University of Arizona and he has taught over 5000 students, mostly in introductory astronomy classes for non-science majors. He taught part of an astrobiology class in the 3D virtual world called Second Life, and more recently he has taught a massive open online course (MOOC) to over 2000 people using the Udemy platform. Impey is the creator of the web site Teach Astronomy, which has gone from peak traffic of 100 visitors a day after its launch in 2012 to 600–700 visitors a day one year later. Teach Astronomy has a full online textbook, over a thousand short video clips, and it also aggregates articles from Wikipedia, nearly 10,000 astronomical images and over a thousand podcasts.
Impey enjoys conveying the excitement of astronomy to general audiences. Several times he has been an eclipse cruise lecturer, and since 2000 he has been a Harlow Shapley Visiting Lecturer and a Smithsonian Associates Lecturer. In 2007, he was a Phi Beta Kappa Visiting Scholar. He has given the Cave lecture at the University of Kingston, the Benjamin Dean Lecture at the California Academy of Sciences, a TEDx lecture in Tucson, and the Robinson Lecture at the Armagh Observatory in Northern Ireland. He gives about twenty public talks a year, to audiences as diverse as kindergartners, NASA engineers, and Tibetan Buddhist monks. In 2014, he was named a Howard Hughes Medical Institute Professor, and awarded $1 million to improve undergraduate education.[10]
Writing
Impey has written a number of popular science books, marked by their incorporation of cutting edge research, and the use of vignettes that place the reader in unfamiliar scenes. The Living Cosmos (2007) is a survey of the emerging field of astrobiology, published initially by Random House and in 2011 republished by Cambridge University Press.
Also with Cambridge University Press, he published a set of interviews with leading researchers in astrobiology, called Talking About Life (2010). He has edited a book on astrobiology based on his long-time association with the Vatican Observatory astronomers, called Frontiers of Astrobiology. He edited a book on the ethical and philosophical implications of the search for extraterrestrial life called Encountering Life in the Universe.
With planetary scientist Bill Hartmann he wrote two introductory textbooks for college-level astronomy, The Cosmic Journey (1994) and The Universe Revealed (2000). On the subject of cosmology, he has written about the origin of the Universe in How It Began (2012) and about the long-term fate of the Universe in How It Ends (2010). With English professor Holly Henry he has written a survey of the scientific and cultural impact of iconic NASA missions in Dreams of Other Worlds (2013). His most recent book, Humble Before the Void (2014), based on teaching cosmology to Tibetan Buddhists in India as part of the Science for Monks program. In 2013, he published his first novel, Shadow World.
Frontiers of Astrobiology, edited with Jonathan Lunine and José Funes (2012) ISBN978-1-107-00641-6
Encountering Life in the Universe: Ethical Foundations and Social Implications of Astrobiology, edited with Bill Stoeger and Anna Spitz (2013) ISBN978-0-8165-2870-7
Dreams of Other Worlds: The Amazing Story of Unmanned Space Exploration, with Holly Henry (2013) ISBN978-0-691-14753-6[18][19]
Humble before the Void: A Western Astronomer, His Journey East, and a Remarkable Encounter between Western Science and Tibetan Buddhism (2014) ISBN978-1-599-47392-5
^Impey, C. D.; Sprayberry, D.; Irwin, M. J. & Bothun, G. D. (1996). "Low Surface Brightness Galaxies in the Local Universe. I. The Catalog". The Astrophysical Journal Supplement Series. 105: 209. Bibcode:1996ApJS..105..209I. doi:10.1086/192313.
^Dinshaw, N.; Foltz, C. B.; Impey, C. D.; Weymann. R. J. & Moris, S. L. (1995). "Large size of Lyman-a gas clouds at intermediate redshifts". Nature. 373 (6511): 223–225. Bibcode:1995Natur.373..223D. doi:10.1038/373223a0. S2CID4267254.
