Warren White a crooked financier, he earned the name "Great White Shark" due to his ruthlessness. He embezzled his company's pension fund and robs almost all of the company's clients both working class and upper class of their life savings. As an attempt to avoid prison he pleads insanity. But knowing that he paid off the jury, the judge sentences him to Arkham Asylum.
Oblivious to the horrors he would face, White entered Arkham thinking that he could buy his way through like everything in his life. But to his discovery became the fresh 'fish' of the Asylum, hated by inmates and staff alike. Even the Joker says that he is the worst person he has ever met, as he kills people, but doesn't take their kids' college funds. Eventually he met with the Asylum psychiatrist, Dr. Anne Carver and offered a bribe of $20 million in return for his transfer to a minimum security prison. She agreed and even become romantically involved with him due to her depression from time spent in the asylum. However to White's horror it was revealed that the real Anne Carver was dead and instead replaced by Jane Doe, who had been using Anne's image for months and after realizing the hell that was Anne's life she attempted to take White's life and live it herself only to be stopped by Batman.
After it was discovered that Jane did all of White's Psych. evaluations his request for a transfer was revoked and he remained in Arkham. He was beaten and abused for the next several weeks (by among others Death Rattle) and was eventually told by the asylum's medic that if he wanted to survive he would need protection. Seeking aid he became Two-Face's 'coin-boy' for several weeks but after realizing that Two-Face would protect him 'only half the time' he asked to quit. Hearing this news Two-Face attempted to flip his coin to decide if White should live or die. However Humpty Dumpty came to his aid and decided that White should belong with him because he felt that White was the worst man that he had ever met and believed that he should be the one to fix him.
Later that night Jane Doe escaped her cell and took White hostage. She then locked him in the Mr. Freeze's sub-zero room and left him to die. After spending hours locked up White slowly lost his sanity along with ears, lips, hair, nose, thumb, and several fingers. Once he got out, he sharpened his teeth to the point. With his newly obtained look and insanity he took up the name 'Great White Shark" and became Arkham's go to guy for special vehicles, weapons, and equipment needed for criminals upon escape.
One Year Later
Batman and Robin have disappeared for a year and the Great White Shark has established himself as Gotham's reigning crime boss. As part of a revenge plot against Two-Face for his earlier betrayal, he orders the Tally Man to kill several criminals associated with the Penguin like Orca, KGBeast, Ventriloquist (Arnold Wesker) in order to frame the newly reformed Harvey Dent for the murders.
During the takeover of Gotham's criminal underworld by Metropolis outfits the 100 and Intergang, Warren White is badly beaten and locked away following his displacement.
The Resurrection of Ra's al Ghul
After the defeat of newly resurrected Ra's Al Ghul, Warren White is shown to be in control of Arkham Asylum and he threatens Ra's when he is admitted to Arkham.
Batman: The Dark Knight- Knight Terrors
Warren White is one of several Arkham inmates injected with combination of Venom and Fear Toxin that give them superhero strength. Many of the inmates are rounded up and caught by Batman before they could get to Gotham, but not Warren. Warren is caught later in Gotham City by the GCPD and James Gordon. Unlike many other infected inmates Warren isn't bleeding out his eyes while the venom wears off, he is though still shouting and ranting about feeding of the blood of Gotham.
In Other Media
Batman Arkham Asylum
Great White has an unlockable biography when solving his Riddler clue. The answer to the riddle is found in the game's morgue where the player finds a jar on a tray containing Warren's nose, lips , an ear and two fingers and is labelled Great White Shark.