[3] In 1909 he became a senior partner at JP Morgan & Company, and in 1910 he was a participant in the secretive meeting on Jekyll Island, Georgia that laid the foundation for the creation of the Federal Reserve system in 1913.

After the war ended, he pressed for the creation of an international organization to coordinate the work of the different national Red Cross societies.

That which calls itself "international" has grown rather provincial… New blood, new methods, a new and more comprehensive outlook, these things are necessary.

However, "Swiss aloofness or unilateralism was hard to overcome",[8] and the relationship between the ICRC and the League became, and remained, a problem for years to come.

Together, they had two sons, and two daughters:[9] Davison died on May 6, 1922, at the age of 54 at his family estate, Peacock Point in Locust Valley, Long Island, while undergoing an operation to remove a brain tumor.