David Hoadley Thorne (born September 16, 1944)[1] is an American businessman and diplomat who served as United States Ambassador to Italy and Ambassador to San Marino from 2009 to 2013.

[2] David Thorne's parents were Alice Smith (Barry) and Landon Ketchum Thorne Jr. David lived in Italy for a decade while his father helped administer the Marshall Plan.

[2] David's twin sister Julia was the first wife of John Kerry.

in American History, where he roomed with Kerry and both were members of Skull and Bones,[3]: 85  and then from Columbia University in 1971 with a master's degree in journalism.

[4] He served in the United States Navy during the Vietnam War, and worked in political consulting, real estate development, and publishing.