Psychologist and Engineer. She was born Lillie Evelyn Moller changing her name to Lillian when in college believing the name more dignified. She married Frank Bunker Gilbreth on Oct 19, 1904. They were the parents of 13 children; 11 survived to adulthood. Following their marriage, Frank started a consulting business called Gilbreth, Inc. to perform time and motion studies with Lillian working at his side. Son Frank Bunker Gilbreth Jr and daughter Ernestine Gilbreth Carey co-authored the books about their family life, "Cheaper by the Dozen" and "Belles on Their Toes." She was the daughter of William Moller and Anna Delger. She obtained her BA (1900) and MA (1902) in Literature from the University of California, Berkeley and she received a doctorate in psychology from Brown University in 1915. She received numerous honorary degrees from universities such as Princeton and the University of Michigan. She and husband Frank pioneered industrial management techniques still in use today that brought worldwide reform and innovation to labor-management relations. They developed the method of time and motion study in the efficiency of industry workers. Frank was concerned with the technical aspects of worker efficiency, while Lillian was concerned with the human aspects of time management. While Frank is considered by many to be the Father of Management Engineering, Lillian is considered by many to be the Mother of Modern Management or sometimes the First Lady of Engineering. Following Frank's death in 1924, Lillian assumed the presidency of Gilbreth, Inc. and continued their work on efficiency in the workplace. In 1935, she went to Purdue as a professor of management and the first female professor in the engineering school. In 1950, she was named an Honorary Member Recipient of the American Society of Mechanical Engineers. In 1966, she won the Hoover Medal of the American Society of Civil Engineers. In 1984, the United States Postal Service issued a stamp in her honor - the first female psychologist so honored. In 1995, she was inducted into the National Women's Hall of Fame. She, along with her husband Frank, have a permanent exhibit in The Smithsonian National Museum of American History and her portrait hangs in the National Portrait Gallery.