[1] In 1964, Roosevelt was recruited by the Secretariat of the United Nations to join the Public Information Department[1] and in the following years, until 1983, held various positions in the international civil service.

[6] Roosevelt obtained his master's degree from the School of Government and Public Law at Columbia University.

[7] He served as a visiting professor at the Geneva School of Diplomacy and International Relations, receiving an honorary doctorate in 2010.

In 1987, he and his wife Marina moved to Deia, Mallorca, where Roosevelt devoted himself to pottery, some of his work being exhibited in a Palma gallery.

Roosevelt's book Too Close to the Sun: Growing up in the Shadow of my Grandparents Franklin and Eleanor was published in 2008 and led to a series of radio and television appearances by the author.

The Roosevelts lived in a small village in the south of France, where Marina served on the municipal council.

[6] In 2013, Roosevelt published an essay in e-book form, "Eyewitness in Israel: 1948", detailing his journey, at age 18, to the then-new nation at the behest of his grandmother Eleanor, with whom he was traveling in Paris and who sent him in her stead to report back.