Vicomte Blaise de Sibour

There have been at least two men named Jacques Blaise de Sibour.

One was born January 29, 1922, London, UK, and died on August 31, 1943 (21) in Russia, apparently while engaged as a soldier in World War II.

The other, identified as Jacques Blaise de Sibour, Jr. (this Jacques Blaise de Siour's father was named Jules, so he's not the fellow this profile is about) attended Princeton, which published his obituary in the Princeton Alumni Weekly, Sept. 14, 2005:

Jacques Blaise de Sibour Jr. '54
Diz [nickname] died July 9, 2005, of cancer at his home in Cape May, N.J.
He prepared for Princeton at Phillips Andover Academy. At Princeton, he majored in history, served as president of the Republican Club, participated in IAA football, basketball, and baseball, and was a member of Colonial Club.
After graduation Diz served in the Army from 1954 to 1956. His subsequent career was in insurance in Washington, D.C., where he became owner/operator of DeSibour Association, an insurance brokerage firm. He was a member of the Metropolitan Club and the Chevy Chase Club, and was a recruiter for Princeton in Washington. He retired in 1994.
Diz is survived by his children, Stephanie, Jacques Blaise III, and Nicole, and four grandchildren. The class extends its condolences to them in their loss.
The Class of 1954

Source: Published in Sept. 14, 2005, issue of Princeton Alumni Weekly, downloaded May 2011 from http://paw.princeton.edu/memorials/14/59/index.xml