Frank B. Gilbreth Jr.

Frank Bunker Gilbreth Jr. (March 17, 1911 – February 18, 2001) was an American journalist and author. He co-authored, with his sister Ernestine, the autobiographical bestsellers Cheaper by the Dozen (1948; which was adapted as a 1950 film) and Belles on Their Toes (1950; which was adapted as a 1952 film). Under his own name, he wrote multiple additional books, such as Time Out for Happiness and Ancestors of the Dozen, and a long-running newspaper column.