The Joker is Jeff Goldblum
The Joker from the Dark Knight is Doctor Ian Malcom from Jurassic park.
The Joker constantly refers to himself as an agent of chaos, Malcom’s speciality is chaos theory- he even calls himself a ”chaostician”
The Joker believes that morals and laws are “a bad joke”, Malcom also believes that it is impossible to try to tame life/nature with artificial rules and constraints.
They even both have distinctive laugh
The incident on Isla Nublar caused Malcom to finally snap and loose all faith in humanity’s ability to control natural behaviour, he became determined prove society wrong
There is no personal information available on the Joker throughout the Dark Knight because InGen went to great lengths to cover up the dinosaur incidents
How did the joker get his scars, he got them when he was injured in a tyrannosaurus attack
(this probably works better with the book Jurassic park than the film as Malcom is more injured and presumed dead)