Maud Humphrey was born to a prominent family in Rochester, New York. She became dedicated to the cause of women's suffrage at an early age. She landed her first illustration commissions while still in her teens, and then studied at the Art Students League of New York and the Julian Academy in Paris. In 1898, she married Dr. Belmont DeForest Bogart, with whom she had a son, Humphrey Bogart, and two daughters, and continued to use her maiden name.
a competition for a Christmas card design, she began working for the publishing firm Frederick A. Stokes Company as an illustrator. From the 1890s through the 1920s, her work included a steady stream of calendars, greeting cards, postcards, fashion magazines, and more than 20 books. She became one of the most recognized, well-paid, and popular illustrators of the era. Her favored medium was watercolors, and her signature style was an idealized chubby-cheeked, happy child -- said to be modeled after her son. She was also a sought-after child portrait artist.