Phillips Payson O'Brien

Phillips Payson O'Brien is the author of The Second Most Powerful Man in the World: The Life of Admiral William D. Leahy, Roosevelt’s Chief of Staff, and professor of strategic studies at the University of St. Andrews in Fife, Scotland.

Fleet Adm. William D. Leahy stands directly behind President Franklin D. Roosevelt, who is seated between Winston Churchill (left) and Joseph Stalin (right), at the Yalta Conference during World War II.

The Hidden Power Behind D-Day

As a key advisor to F.D.R., Adm. William D. Leahy was instrumental in bringing the Allies together to agree upon the invasion of Nazi-occupied Europe

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