- Son of an Italian countess and a Russian diplomat.
- Younger brother of costume designer Oleg Cassini.
- One time brother-in-law of actress Gene Tierney.
- Said to have coined the term 'Jet Set' to describe the rich practitioners of aimless, globe-hopping travel.
- Eminent society gossip columnist for the Hearst newspapers in the U.S. during the 1940s and 1950s, using as his byline that quintessentially New-York pseudonym, Cholly Knickerbocker. (The wholly fictional "Father Knickerbocker" is to New York as the equally fictional "Uncle Sam" is to the U.S. There was also a a New York brew called Knickerbocker Beer, and there remains today in New York a professional basketball team, the Knickerbockers.)
- Uncle of Christina Cassini and Daria Cassini.
- Daughter with Waters: Marina.
- Son with Wrightsman: Alexander.
- Two sons with Brenda Mitchell: Nicholas and Dimitri.
- Survived by his brother, Oleg Cassini and his four children, Marina, Alexander, Nicholas and Dimitri; a stepchild, Dana Wrightsman Dantine (son of Helmut Dantine; four grandchildren; and two great-grandchildren.
- Former son-in-law of Harrison Muller Sr. and Patricia Noto. Former brother-in-law of Harrison Muller.
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