Donald E. Osterbrock, astrophysicist, astronomer, and historian, died on January 11, 2007. He was 82. At the time of his sudden death from a heart attack, Osterbrock was a professor emeritus of astronomy and astrophysics at the University of California, Santa Cruz, where he continued to conduct research and mentor graduate students since his 1992 retirement.
Later in life, Osterbrock pursued his interest in the history of astronomy. After retirement, he published historical works about notable figures in the history of astronomy, including James Keeler, George Ellery Hale, George Willis Ritchey, and Walter Baade. He also published institutional histories of the Lick and Yerkes observatories for their centennial celebrations in 1988 and 1997. The many awards and honors Osterbrock received during his long career included the Bruce Medal of the Astronomical Society of the Pacific, the Henry Norris Russell Lectureship of the American Astronomical Society, and the Gold medal of the Royal Astronomical Society.
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