The Doctrine Developer job description is fulfilled by James Monroe, a sixth President of the United States. He was a Founding Father and served as the fifth Secretary of State under President James Madison. Monroe is best known for his foreign policy, which became known as the Monroe Doctrine. This doctrine declared that the United States would not interfere in European affairs and that any attempt by a European power to colonize or interfere with the affairs of the Americas would be seen as an act of aggression. Monroe's Doctrine was a major factor in the development of American foreign policy and has been a cornerstone of US foreign policy ever since.