Nobody???
OK, a possible answer can be reasoned as follows:
Assume a high-jumper is a 6 feet tall man who can vault a 5 foot bar. Further assume that the center of gravity on such a man is 3.5 feet off the ground. Therefore, to jump over the bar he must raise his center of gravity by 2.5 feet.
On the moon, gravity is 1/6 that of Earth. So a jumper could achieve 6 times the height he could on Earth. The high jumper would be able to raise his center of gravity by 2.5 * 6, or 15 feet in a moon jump. Add back to that the height of his center of gravity, which is 3.5 feet, and you get that he can jump over a bar that is 18.5 feet off the ground.