
Philip Dey "Phil" Eastman was an American screenwriter, children's author, and illustrator. As an author, he is known primarily as P. D. Eastman. A protégé of Theodor Geisel (Dr. Seuss), Eastman wrote many books for children, in his own distinct style under the Dr. Seuss brand of Random House, many of which were in the Beginner Books series. 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 films, wrote for the animation Mr. Magoo, and the Gerald McBoing-Boing series for UPA.
Books

Are You My Mother?
1960

Aaron is Cool
2015

Dr. Seuss Book Set (6)
The Cat in the Hat - Green Eggs and Ham - Are You My Mother - Sam and the Firefly - Abc - The Foot Book
2006

Go, Dog. Go!
1961

Aaron is a Good Sport
2015

The Big Purple Book of Beginner Books
2012

The BIG Red Book of Beginner Books
1995

Aaron Loves Apples and Pumpkins
2015

Red, Stop! Green, Go!
An Interactive Book of Colors
2004

Aaron Has a Lazy Day
2015

The Best Nest
1968

The Cat in the Hat Dictionary (Bright and Early Books)
1964

What Time Is It?
1979

Big Dog…Little Dog
1973

Sam and the Firefly
1958

You Are My Mother
Inspired by P.D. Eastman's Are You My Mother?
2020

Flap Your Wings
1969

Sam and Gus Light Up the Night!
2004

The Alphabet Book
1974

Whoa, Dog. Whoa! How to Relax
Inspired by P.D. Eastman's Go, Dog. Go!
2020