Theodor Seuss Geisel was an American writer, poet, and cartoonist most widely known for his children's books written under the pen names Dr. Seuss, Theo LeSieg and, in one case, Rosetta Stone. At our house we have many, many books written by Mr Geisel and I have even at times memorized a book or two. My favorite is Fox In Sox. What is yours? Today, Let's be thankful for Dr. Seuss and the books he has written.