Question: What nationality was Theodor Seuss Geisel, better known as Dr. Seuss, children's author and creator of the Grinch?

Context articles: Do You Know What I'm Going to Do Next Saturday?
Dr. Seuss's ABC
Dr. Seuss bibliography
Dr. Seuss Memorial
Geisel Library
Dr. Seuss Goes to War
Dr. Seuss
The Secret Art of Dr. Seuss
Helen Palmer (author)
Grinch

Do You Know What I'm Going To Do Next Saturday?
 is a 1963 children's book published by Beginner Books and written by Helen Palmer Geisel, the first wife of Theodor Seuss Geisel (Dr. Seuss).
 Unlike most of the Beginner Books, "Do You Know What I'm Going To Do Next Saturday?"
 did not follow the format of text with inline drawings, being illustrated with black-and-white photographs by Lynn Fayman, featuring a boy named Rawli Davis.
 It is sometimes misattributed to Dr. Seuss himself.
 The book's cover features a photograph of a young boy sitting at a breakfast table with a huge pile of pancakes.
Dr. Seuss's ABC is a 1963 children's A to Z alphabetical picture book by Dr. Seuss (Theodor Seuss Geisel).
 It was published as part of the Random House Beginner Books series.
 It contains several short poems about a variety of characters, and is designed to introduce basic alphabet book concepts to children.
Theodor Seuss Geisel, better known as Dr. Seuss, published over 60 children's books over the course of his long career.
 Though most were published under his well-known pseudonym, Dr. Seuss, he also authored over a dozen books as Theo.
 LeSieg and one as Rosetta Stone.
 As one of the most popular children's authors of all time, Geisel's books have topped many bestseller lists, sold over 222 million copies, and been translated into more than 15 languages.
 In 2000, when "Publishers Weekly" compiled their list of the best-selling children's books of all time; 16 of the top 100 hardcover books were written by Geisel, including "Green Eggs and Ham", at number 4, "The Cat in the Hat", at number 9, and "One Fish Two Fish Red Fish Blue Fish", at number 13, and "Dr. Seuss's ABC".
 In the years following his death in 1991, several additional books based on his sketches and notes were published, including "Hooray for Diffendoofer Day!
" and "Daisy-Head Mayzie".
 Although they were all published under the name Dr. Seuss, only "My Many Colored Days", originally written in 1973, was entirely by Geisel.
The Dr. Seuss National Memorial Sculpture Garden is a sculpture garden in Springfield, Massachusetts that honors Theodor Seuss Geisel, better known to the world as Dr. Seuss.
 Located at the Quadrangle, the Dr. Seuss National Memorial Sculpture Garden honors the author and illustrator, who was born in Springfield in 1904.
 The monument was designed by Lark Grey Dimond-Cates, the author's stepdaughter and created by Sculptor and Artist Ron Henson.
Geisel Library is the main library building of the University of California San Diego Library.
 It is named in honor of Audrey and Theodor Seuss Geisel, better known as Dr. Seuss.
 The building's distinctive Brutalist architecture has resulted in its being featured in the UC San Diego logo and becoming the most recognizable building on campus.
Dr. Seuss Goes to War: The World War II Editorial Cartoons of Theodor Seuss Geisel is a 1999 book written by Richard H. Minear, containing Dr. Seuss's political cartoons created during World War II.
Theodor Seuss Geisel ( ; March 2, 1904 – September 24, 1991) was an American author, political cartoonist, poet, animator, book publisher, and artist, best known for authoring children's books under the pen name Dr. Seuss ( ).
 His work includes several of the most popular children's books of all time, selling over 600 million copies and being translated into more than 20 languages by the time of his death.
The Secret Art of Dr. Seuss (ISBN  ) is a collection of visual art created by Theodor Seuss Geisel, better known as Dr. Seuss.
 It was published in 1995, after Geisel's death, by Random House of New York.
Helen Marion Palmer Geisel (September 23, 1898 – October 23, 1967), known professionally as Helen Palmer, was an American children's author, editor, and philanthropist.
 She was married to fellow author Theodor Seuss Geisel, better known as Dr. Seuss, from 1927 until her death.
 Her best-known books include "Do You Know What I'm Going to Do Next Saturday?
", "I Was Kissed by a Seal at the Zoo", "Why I Built the Boogle House", and "A Fish Out Of Water".
The Grinch is a fictional character created by Dr. Seuss.
 He is best known as the main character of the children's book "How the Grinch Stole Christmas!
" (1957).