Father Goose: His Book is a collection of nonsense poetry for children, written by L. Frank Baum and illustrated by W. W. Denslow, and first published in 1899. Though generally neglected a century later, the book was a groundbreaking sensation in its own era; "once America's best-selling children's book and L. Frank Baum's first success," Father Goose laid a foundation for the writing career that soon led to The Wonderful Wizard of Oz and all of Baum's later work.