John Jay - Wikipedia

On September 26, 1789, Thomas Jefferson was appointed the first Secretary of State, and John Jay became first US Chief Justice. From the article:

"Jay was born into a wealthy family of merchants and New York City government officials of French and Dutch descent. He became a lawyer and joined the New York Committee of Correspondence, organizing opposition to British policies in the time preceding the American Revolution. Jay was elected to the Second Continental Congress, and served as President of the Congress. From 1779 to 1782, Jay served as the ambassador to Spain; he persuaded Spain to provide financial aid to the fledgling United States. He also served as a negotiator of the Treaty of Paris, in which Britain recognized American independence. Following the end of the war, Jay served as Secretary of Foreign Affairs, directing United States foreign policy under the Articles of Confederation government. He also served as the first Secretary of State on an interim basis.

A proponent of strong, centralized government, Jay worked to ratify the United States Constitution in New York in 1788. He was a co-author of The Federalist Papers along with Alexander Hamilton and James Madison, and wrote five of the 85 essays. After the establishment of the new federal government, Jay was appointed by President George Washington the first Chief Justice of the United States, serving from 1789 to 1795. The Jay Court experienced a light workload, deciding just four cases over six years. In 1794, while serving as Chief Justice, Jay negotiated the highly controversial Jay Treaty with Britain. Jay received a handful of electoral votes in three of the first four presidential elections, but never undertook a serious bid for the presidency.

Jay served as the Governor of New York from 1795 to 1801. Long an opponent of slavery, he helped enact a law that provided for the gradual emancipation of slaves, and the institution of slavery was abolished in New York in Jay's lifetime. In the waning days of President John Adams's administration, Jay was confirmed by the Senate for another term as Chief Justice, but he declined the position and retired to his farm in Westchester County, New York."