Dr. Seuss Day is a holiday that celebrates the birthday (March 2nd) of Theodor Seuss Geisel, otherwise known by the pen name by which he authored children's books: Dr. Seuss. During the 1990s, the National Education Association (NEA) advocated for a day to celebrate reading all over the United States. In 1998, it started Read Across America and decided to hold it on the same day as Dr. Seuss' birthday.