Bosworth was also responsible to a large degree for the architectural expression of Kykuit, the Rockefeller family estate in Pocantico Hills, New York, working closely with the architects William Adams Delano and Chester H. Aldrich, and the interior designer Ogden Codman.

[4] Bosworth was born in 1868 in Marietta, Ohio, and received his architectural training at the Massachusetts Institute of Technology, at the time one of the leading Beaux-Arts oriented schools in the United States.

Upon his return to the United States in 1900, Bosworth worked for the firm Carrère and Hastings, which had recently won the competition for the design of the New York Public Library, their most significant and best-known project.

It was a modern steel structure clad top to bottom in a Greek-styled exterior, the three-story-high Ionic columns of Vermont granite forming eight registers over a Doric base.

In 1913, Bosworth received the commission to design the new campus of the Massachusetts Institute of Technology in Cambridge, MIT having outgrown its old buildings near Copley Square in Boston.

In 1921 Bosworth built his own house, "Old Trees," on Long Island next to that of Stone, inviting the sculptor Gaston Lachaise, with whom he had worked on the AT&T building, to carve four reliefs representing the four seasons out of sandstone.

Bosworth was named Secrétaire Général of the "Comité Franco-Américain pour la Restauration des Monuments", a Committee created by John D. Rockefeller Jr. to supervise his donations.

Former French ambassador to the United States Jean Jules Jusserand was given the presidency of this Committee, while American banker Henry Herman Harjes became its treasurer.

[7] The other two members were former Minister for Foreign Affairs Gabriel Hanotaux and historian and diplomat Maurice Paléologue who was also president of the Société des Amis de Versailles.