Eastman started life in Amherst, Massachusetts to Clarence Willis and Ann Hull Eastman. After preparing at Phillips Academy and Williston Academy, he finished Amherst College in 1933 and later from the National Academy of Design.
(P.D. Eastman photo #2)
From 1936 to 1941, Eastman worked at the story department of Walt Disney Productions. From 1941 to 1943 he worked at the story department of Warner Bros. Cartoons. From 1945 to 1952 he worked in the story department of United Productions of America. He contributed to the Private Snafu World War Ii training movies, created for the animation Mr. Magoo, and the Gerald Mcboing-boing series for Upa.
(P.D. Eastman photo #3)
A protege of Theodor Geisel , Eastman created many works for children, in his own distinct style under the Dr. Seuss brand of Random House, many of which were in the Beginner Works series.