Considered one of the most versatile athletes of modern sports, he won Olympic gold medals in the 1912 pentathlon and decathlon, and played American football (collegiate and professional), professional baseball, and basketball.
He lost his Olympic titles after it was found he had been paid for playing two seasons of semi-professional baseball before competing in the Olympics, thus violating the amateurism rules that were then in place. In 1983, 30 years after his death, the International Olympic Committee (IOC) restored his Olympic medals.
Look closely at the photo, you can see that he's wearing different socks and shoes. This wasn't a fashion statement. It was the 1912 Olympics, and Jim, an American Indian from Oklahoma represented the U.S. in track and field. On the morning of his competitions, his shoes were stolen. Luckily, Jim ended up finding two shoes in a garbage can. That's the pair that he's wearing in the photo. But one of the shoes was too big, so he had to wear an extra sock. Wearing these shoes, Jim won two gold medals that day.