tony hawk is the most famous skateboarder in the world. He has won more skateboarding competitions than anybody else. He has also invented more than eighty skateboarding tricks kricks and was the first person to do one famous trick called the 900. the 900 is a 360 somersault done two and a half times in the air! It took him six years to learn the 900. He finally it in 1999. Since then only four other people have been able ti do it.