Frank Bunker Gilbreth Sr. was an American engineer and management consultant, known for his pioneering work in the field of time and motion study. Born on March 7, 1868, he aimed to improve efficiency in various industries by analyzing workflows and eliminating unnecessary movements. His innovative techniques laid the groundwork for modern industrial engineering. Gilbreth is also recognized for his contributions to the field of psychology, particularly in understanding human behavior in the workplace. He co-authored the book Cheaper by the Dozen, which details his experiences raising a large family while applying his efficiency principles at home.