The Prominent Americans Series was a definitive stamp collection issued by the U.S. Post Office Department between 1965 and 1978. Unlike previous series, it spotlighted individuals across various fields, including politics, science, and the arts—such as Albert Einstein, Eleanor Roosevelt, and Martin Luther King Jr. Designed with simplicity and cultural depth, these stamps reflected a broader vision of American achievement. Collectors value this series for its historical significance, variety of denominations, and engraving quality. Today, it stands as a philatelic tribute to American innovation and diversity.