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...Jessup played a critical role in drafting the charters and statutes that formed many of today’s leading international organizations.

Jessup’s initial work began in 1943, when he was named the chief of training and personnel at the State Department’s Office for Foreign Relief and Rehabilitation (which later became the United Nations Relief and Rehabilitation Administration).

Working with the State Department in the 1940s, Jessup also served as assistant secretary at the Bretton Woods Conference in 1944 that resulted in the formation of the World Bank and the International Monetary Fund.

Following World War II, Jessup participated in the development of the statute of the International Court of Justice and served on the Committee on the Codification and Progressive Development of International Law, which drafted the statute of the International Law Commission.

Jessup’s dedication to research and scholarly pursuits during this time kept him deeply tied to Columbia Law School, where he was appointed the Hamilton Fish Professor of International Law and Diplomacy. In 1948, he published his much-acclaimed book The Modern Law of Nations.

Not only did Jessup have an active role in developing the legal structures of the United Nations, he became a skilled diplomat in that arena.

In 1948, he was appointed deputy U.S. representative to the United Nations Security Council and from 1949 to 1953, he served as ambassador-at-large, in which capacity he was embroiled in numerous diplomatic negotiations during the growing tensions between the United States and the Soviet Union.

From his vast experience in United Nations negotiations, Jessup later wrote a series of Hague Academy lectures entitled Parliamentary Diplomacy on procedure and politics at the United Nations.

Years later, in 1974, Jessup also wrote The Birth of Nations, which described in detail many of the diplomatic and political struggles within the post-war United Nations, including efforts to develop a trusteeship for a Palestinian territory as a resolution to the Arab-Israeli conflict....

...Overcoming the obstacles posed by McCarthy’s tactics, Truman granted Jessup a one year recess appointment to the post in 1952. Jessup then returned to academia in 1953 at Columbia Law School and became a symbol of resistance to the McCarthy movement. In 1955, he was elected President of the American Society of International Law, and in 1959, Vice President of the Institut de Droit International...
http://www.judicialmonitor.org/archive_summer2010/leadingfigures.html

There’s nothing about his personal life...