William Caspar Graustein

William Caspar Graustein
Left to right, upper: Graustein, Smith, lower: Rellich, Ms. Graustein, at the ICM, Zürich 1932.
Born	(1888-11-15)15 November 1888 Cambridge, Massachusetts
Died	22 January 1941(1941-01-22) (aged 52) Cambridge, Massachusetts
Nationality	American
Alma mater	Harvard University
Scientific career
Fields	Mathematics
Institutions	Harvard University
Doctoral advisor	C. H. Eduard Study

William Caspar Graustein (15 November 1888 – 22 January 1941) was an American mathematician. He graduated magna cum laude from Harvard University in 1910 and later became an instructor at Harvard University.

Some of his books and papers are: