Thomas Guernsey Moore (1874-1925) was a talented illustrator and an acknowledged authority on lettering, design, and decoration. He debuted his first Saturday Evening Post cover on June 30, 1900; he ultimately painted 63 covers for the Post, the final cover appearing on January 19, 1924.

Moore lived spent most of his life in Philadelphia area. He studied at Germantown Academy and the Pennsylvania Academy of Fine Arts. Early in his career, he worked at the Philadelphia Press and shared a studio with fellow Post illustrator George Gibbs.

Moore holds the distinction of designing the first color cover to appear in the Post. In 1900 he also designed a new style of lettering for the magazine’s masthead. In 1904 he became the art editor of the Post. Moore also held the position of art director at Country Gentleman magazine, the Beck Engraving Company, George L. Boyer Company, and Calkins & Holden. Later, he became a costumer and decorator for theaters and pageants, including a Red Cross pageant in 1917 and another on Women’s Suffrage in 1921.