Benjamin Franklin (January 17, 1706 [O.S. January 6, 1705] – April 17, 1790) was an American polymath active as a physicist, philosopher, statesman and inventor who was one of the Founding Fathers of the United States. He was a drafter and signer of the Declaration of Independence, and the first postmaster general. Born in the Province of Massachusetts Bay, Franklin became a successful newspaper editor and printer in Philadelphia, the leading city in the colonies, publishing The Pennsylvania Gazette at age 23. He became wealthy publishing this and Poor Richard's Almanack, which he wrote under the pseudonym "Richard Saunders". After 1767, he was associated with the Pennsylvania Chronicle, a newspaper known for its revolutionary sentiments and criticisms of the policies of the British Parliament and the Crown. He pioneered and was the first president of the Academy and College of Philadelphia, which opened in 1751 and later became the University of Pennsylvania. He organized and was the first secretary of the American Philosophical Society and was elected its president in 1769. He was appointed deputy postmaster-general for the British colonies in 1753, which enabled him to set up the first national communications network. Franklin was active in community affairs and colonial and state politics, as well as national and international affairs. He became a hero in North America when, as an agent in London for several colonies, he spearheaded the repeal of the unpopular Stamp Act by the British Parliament. An accomplished diplomat, he was widely admired as the first U.S. ambassador to France. Franklin used referent power to develop positive Franco–American relations and successfully secured vital French support for the American Revolutionary War. From 1785 to 1788, he served as President of Pennsylvania. From at least as early as 1735 through the following decades, Franklin owned at least seven slaves and ran "for sale" ads for slaves in his newspaper, but by the late 1750s, he had begun arguing against slavery, became an active abolitionist, and promoted the education and integration of African Americans into U.S. society. As a scientist, Franklin's studies of electricity made him a major figure in the American Enlightenment and the history of physics. He also charted and named the Gulf Stream current. His numerous important inventions include the lightning rod, bifocals, glass harmonica and the Franklin stove. He founded many civic organizations, including the Library Company, the University of Pennsylvania, and Philadelphia's first fire department. Franklin earned the title of "The First American" for his early and indefatigable campaigning for colonial unity. He was the only person to sign the Declaration of Independence, the Treaty of Paris peace with Britain, and the Constitution. Foundational in defining the American ethos, Franklin has been called "the most accomplished American of his age and the most influential in inventing the type of society America would become". Franklin's life and legacy of scientific and political achievement, and his status as one of America's most influential Founding Fathers, have seen him honored for more than two centuries after his death on the $100 bill and in the names of many towns and counties, educational institutions and corporations, as well as in numerous cultural references and a portrait in the Oval Office. His more than 30,000 letters and documents have been collected in The Papers of Benjamin Franklin.