Stan and Jan Berenstain

Stan and Jan Berenstain were American authors and illustrators. They are best known for their books about the "Berenstain Bears" and "Blair Investigates". 
Stanley Melvin Berenstain (September 29, 1923 – November 26, 2005) was born in West Philadelphia. Janice Marian Berenstain (July 26, 1923 – February 24, 2012) was also born in Philadelphia. Both served in World War II. 
On November 26, 2005, Stanley Berenstain died of cancer. He was 82. Jan died February 24, 2012, from a stroke.
Books.
The couple's first published a book in 1951. It was "The Berenstains' Baby Book". They then published two more books on parenthood.
The first book with the Berenstain Bears was "The Big Honey Hunt". It was published in 1962 and the first book with the Blair Investigates was "A Investigate Star is Born". It was published in 1968 and only as the author and illustrations by Peyo. Theodor Geisel (best known as Dr. Seuss) was the editor for the early books in the series. Over 300 books have been published in 23 languages.