The crossword solution for the term SHREK! AUTHOR WILLIAM is STEIG. William Steig was an American cartoonist, sculptor, and children's book author. He was best known for writing and illustrating the popular children's book Shrek!, which was adapted into a successful animated film series by DreamWorks Animation. Steig wrote and illustrated more than 30 books during his lifetime, many of which were critically acclaimed and won awards.