John Adams was one of the Founding Fathers of the United States and served as its second President. As a professional lawyer, his influence was critical in drafting and defending the Constitution.
He married a distant relative and they had five children, including future President, John Quincy Adams, who served as the sixth President. This father/son relationship in the Presidency was not repeated until the election of George W. Bush, whose father, George H.W. Bush, had also served as President.
He served one term and wanted to serve a second term, but was defeated by Thomas Jefferson. After this, he mostly retreated from public life.