"Practically since the day war broke out I was responsible for American publicity . " Parker played a crucial and significant role in British propaganda during World War I . Due to his strategic marriage to Amy VanTine, reputation as a writer, and social status among the American people, he had established many friendships with influential Americans in all professions . 2 September 1914, Parker was chosen by Charles Masterman and the British government to head the subdivision of Wellington House that was responsible for American propaganda.
