Olin J. Eggen

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Olin Jeuck Eggen (July 9, 1919 – October 2, 1998) was an American-Australian astronomer. Olin Jeuck Eggen was born to Olin Eggen and Bertha Clare Jeuck in the village of Orfordville located in Rock County, Wisconsin. Both of his parents were of Norwegian extraction. He graduated from the University of Wisconsin–Madison in 1940. After serving in World War II in the OSS, he returned to the university and received his Ph.D. in astrophysics in 1948. He became known as one of the best observational astronomers of his time. He is best known for a seminal 1962 paper with Donald Lynden-Bell and Allan Sandage which suggested for the first time that the Milky Way Galaxy had collapsed out of a gas cloud. He pioneered the now-accepted notion of moving groups, and introduced the idea that these may originate from dissolved open clusters. For the 1965 book Galactic Structure, edited by Blaauw and Schmidt, Eggen wrote an important chapter on moving groups of stars. He won the Henry Norris Russell Lectureship in 1985.