He has English, with a smaller amount of Dutch, French, and Irish, ancestry.
Since Diana Spencer was the great-granddaughter of the 3rd Baron Fermoy and Platt was his great-great-grandson, this makes him a second-cousin, once-removed, of Princess Diana, Princess of Wales. By extension, he is the third cousin of Prince William Windsor.
Was friends with Huff (2004) co-star Hank Azaria at Tufts University.
Attended Tufts University.
His mother, Sheila Maynard, was the daughter of Walter Maynard and wife Eileen Burden Maynard Robins (October 15, 1910 - March 24, 1970) and a granddaughter of the Hon. Cynthia Burke-Roche (October 4, 1884 - August 12, 1966), who married (1) Arthur Scott Burden (August 11, 1879 - June 15, 1921) in 1906, and (2) Guy Fairfax Cary Sr. (November 14, 1879 - August 27, 1950) in 1922. Cynthia was the sister of Edmund Maurice Burke-Roche, 4th Baron Fermoy in the Peerage of Ireland (of Irish and English extraction and son of the American heiress Frances Ellen Work), who was the maternal grandfather of Diana, Princess of Wales.