Portrait engraving circa 1826 of John Quincy Adams. Adams (1767 – 1848) was the sixth US President and held office from 1825 to 1829. His father John Adams was the second US President (1797 – 1801). Quincy Adams was also a diplomat involved in many international negotiations and helped formulate the Monroe Doctrine (1823) - the policy of US opposition to European interference in the Americas - while Secretary of State under President James Monroe. Engraving by Asher Brown Durand (1796 – 1886), based on a painting by artist Thomas Sully (1783 – 1872).