Thomas Nast was a famous cartoonist from the late 19th and early 20th centuries. He was known for his political cartoons, which often featured animals and were critical of the government. His work was published in magazines such as Harper's Weekly and Puck. He was also the creator of the modern version of Santa Claus. His last name is Nast, and his first name is ARNO. He was also known for his use of GRAY tones in his cartoons.