Robert Julius Trumpler

Robert Julius Trumpler
Born	Robert Julius Trümpler (1886-10-02)October 2, 1886 Zurich, Switzerland
Died	September 10, 1956(1956-09-10) (aged 69) Berkeley, California, U.S.
Citizenship	Swiss · American
Education	Universität Zürich University of Göttingen (PhD)
Employer(s)	University of California Allegheny Observatory Lick Observatory
Organization	United States National Academy of Sciences
Known for	Galactic cluster Trumpler classification

Robert Julius Trumpler (October 2, 1886 – September 10, 1956) was a Swiss-American astronomer.