 In the years following his mayoralty, Weightman would be curator of the Columbia Institute; a founding member and officer of the Washington National Monument Society; Grand Master of the Freemasons of the District of Columbia; chief clerk, and later librarian, of the United States Patent Office; and a General in the Union Army during the Civil War — not to mention the center of Washington's social activity.In addition to his busy social and professional life, Weightman was a noted and generous philanthropist — generous enough that his sizable fortune had dwindled to very little by the 1870s, when Weightman was living on his pension as a soldier and employee of the Patent Office.However, upon his death on February 2, 1876, his funeral was one of the best attended and most remembered of the era.