First female psychologist honored on a U.S. postage stamp

On February 24, 1984, the United States Postal Service issued a 40-cent stamp in the Great Americans series to honor Lillian Gilbreth, making her the first female psychologist featured on a U.S. postage stamp. This acknowledgment recognized her monumental contributions to psychology and engineering, affirming her status as an influential figure in American history. Her work championed the integration of psychological principles in workplace engineering, thus influencing vast improvements in industry operations and elevating her as a trailblazer for women in science and engineering.