Lillian Evelyn Gilbreth (; May 24, 1878 – January 2, 1972) was an American psychologist, industrial engineer, consultant, and educator who was an early pioneer in applying psychology to time-and-motion studies. She was described in the 1940s as "a genius in the art of living." Gilbreth, one of the first female engineers to earn a Ph.D., is considered to be the first industrial/organizational psychologist. She and her husband, Frank Bunker Gilbreth, were efficiency experts who contributed to the study of industrial engineering, especially in the areas of motion study and human factors. Cheaper by the Dozen (1948) and Belles on Their Toes (1950), written by two of their children (Ernestine and Frank Jr.) tell the story of their family life and describe how time-and-motion studies were applied to the organization and daily activities of their large family. Both books were later made into feature films. Early life and education Lillie Evelyn Moller was born in Oakland, California, on May 24, 1878, to Annie () and William Moller, a builder's supply merchant. She was their second child and the eldest of the family's nine surviving children. Their first child, Anna Adelaide, had died at age four months. Her parents, of German ancestry, were well to-do. Educated at home until the age of nine, Moller began formal schooling in the first grade at a public elementary school and was rapidly promoted through the grade levels. She was elected vice president of her senior class at Oakland High School and graduated with exemplary grades in May 1896. Although Moller wanted to go to college, her father was opposed to such education for his daughters. Because of this, she did not take all the required college preparatory courses in high school. She did persuade her father to let her try college for a year and was admitted to the University of California on the condition that she took the missing Latin course from high school in her first semester at university. In August 1896, Moller was one of 300 entering students. The University of California at that time was housed in four buildings in the hills above the little town of Berkeley. It charged no tuition for California residents and was underfunded. Classes were large and many were held in tents. There were no dormitories; men lived in nearby boarding houses and women commuted from home. Moller did well enough during her first year,