Presidents' Day, officially known as Washington's Birthday at the federal governmental level, is a holiday in the United States celebrated on the third Monday in February. It is often celebrated to honor all those who served as presidents of the United States and, since 1879, has been the federal holiday honoring Founding Father George Washington, who led the Continental Army to victory in the American Revolutionary War, presided at the Constitutional Convention of 1787, and was the first United States president. The portrait of Washington shown here was one of 130 copies that the American painter Gilbert Stuart made of his unfinished Athenaeum Portrait, which is Stuart's most notable work and the basis for the engraving of Washington on the United States one-dollar bill. This copy is in the collection of the Clark Art Institute in Williamstown, Massachusetts.Painting credit: Gilbert Stuart