“Jasper’s last name is Whitlock. He was human in Texas during the Civil War (his story will be told in detail in book three), so only Carlisle has been a vampire longer. He was twenty when he became a vampire (he was changed by a vampire named Maria). Alice’s nickname for him is "Jazz." He is 6′3" tall.” - SM, Lexicon


“Okay, Jasper things. I love me some Jasper. Firstly, the reason Jasper has the most trouble with the Cullen diet is that he has been around since the Civil War and he has consumed a LOT of human blood. He has formed really bad habits. Also, my boy is a fighting machine (and I’m not talking about Civil War/human fights here, though he was a major in the Confederate army when he was human). The Cullen lifestyle is like an almost incomprehensibly peaceful retirement for him.

Secondly, he’s really mostly doing this for Alice. Alice is Jasper’s entire life. She is the most important thing in the universe to him, and he would do absolutely anything for her. For Jasper, there would be no limit to who or what he would destroy for Alice. Not that she wants him destroying anything. She’s the light side of their relationship–she makes him laugh (and he wasn’t much of a laugher before Alice). Jasper is the most "vampire-y" of the Cullens, and, while he’s fond of them all, he’s not bonded to them the way the rest of them are. The way Alice most definitely is. The whole high school thing really freaks him out. He’s trying to get better at being around humans, but it’s an uphill struggle.”
- SM, Lexicon


“About Jasper using the name Hale–it’s just for convenience. He and Rosalie look a lot alike. They actually look like fraternal twins–both the same color blond, both tall, him muscular and her statuesque (with the same pale skin, gold eyes and flawless beauty, of course). The Cullens use many different subterfuges to try to keep people from looking too closely at them. Anything that seems to be a certain way–like Rosalie and Jasper seeming to be related–they embrace. They work within people’s expectations. People assume the two blonds are related, so they let that assumption stand. Plus, the more complicated a story is, the quicker someone gets bored trying to understand it, and gives up.

They could be Whitlocks, it wouldn’t make any difference to anyone accept Rosalie. Jasper doesn’t care what anyone calls him. But Rosalie clings to her human past with all ten fingers.” - SM, Lexicon


TwilightMoms: How is the chemistry between yourself and Jackson Rathbone? (on and off screen)
Ashley Greene: Jackson is an awesome guy! Such a fun person to be around. And I think there is a bit of chemistry with everyone in the cast. We all get along great. We all hang out and goof off together.

Eclipse-la: One word (or more... your choice) to describe each member of the cast?
Ashley Greene: Jackson/Jasper-- My Love! HAHA I love having him as a soulmate for eternity!