Thomas Mifflin (January 10, 1744 – January 20, 1800) 5th President of the United States in Congress Assembled was an American merchant and politician from Philadelphia, Pennsylvania. He was a major general in the Continental Army during the American Revolution, a member of the Pennsylvania Provincial Assembly, a Continental Congressman from Pennsylvania. He served as Speaker of the Pennsylvania House of Representatives, President of the Pennsylvania Supreme Executive Council and the first Governor of Pennsylvania.