Hal Jordan is an air force test pilot who was the first human of Earth to ever be inducted into the Green Lantern Corps. He has been called by some to be the greatest Green Lantern of all time and is also a founding member of the Justice League.
He has also been known as Parallax and The Spectre. He also was the first Green Lantern to recite the famous oath that is now said by many other Green Lanterns.
When he first started his training as a Green Lantern, Hal Jordan was trained by Sinestro and Kilowog. As a Green Lantern he is vulnerable to the color yellow.