Abraham Alfonse Albert Gallatin (January 29, 1761 – August 12, 1849) was a Genevan–American politician, diplomat, ethnologist and linguist. Often described as "America's Swiss Founding Father", he was a leading figure in the early years of the United States, helping shape the new republic's financial system and foreign policy. Gallatin was a prominent member of the Democratic-Republican Party, represented Pennsylvania in both chambers of Congress, and held several influential roles across four presidencies, most notably as the longest serving U.S. Secretary of the Treasury. He is also known for his contributions to academia, namely as the founder of New York University and cofounder of the American Ethnological Society.
Gallatin was born in Geneva in present-day Switzerland and spoke French as a first language. Inspired by the ideals of the American Revolution, he immigrated to the United States in the 1780s, settling in western Pennsylvania. He served as a delegate to the 1789 Pennsylvania Constitutional Convention and won election to the Pennsylvania General Assembly. Gallatin was elected to the United States Senate in 1793, emerging as a leading Anti-Federalist and opponent of Alexander Hamilton's economic policies. However, he was soon removed from office on a party-line vote due to not meeting requisite citizenship requirements; returning to Pennsylvania, Gallatin helped calm many angry farmers during the Whiskey Rebellion.
Gallatin won election to the House of Representatives in 1795, where he helped establish the House Ways and Means Committee. He became the chief spokesman on financial matters for the Democratic-Republican Party and led opposition to the Federalist economic program. Gallatin helped Thomas Jefferson prevail in the contentious presidential election of 1800, and his reputation as a prudent financial manager led to his appointment as Treasury Secretary. Under Jefferson, Gallatin reduced government spending, instituted checks and balances for government expenditures, and financed the Louisiana Purchase.