Warden Sharp

Warden Quincy Sharp has been running Arkham Asylum for the past three years and has dedicated his life to restoring sanity to the so-called super villains that plague Gotham City. He is currently campaigning to become the next mayor of Gotham; to facilitate the campaign, he has instigated stringent new security and experimental research policies at Arkham.

After apprehending the Joker, Batman called Warden Sharp to tell him that he would arrive in fifteen minutes. Warden Sharp notified the Arkham security staff of his frustration of the Joker's previous escape and would not tolerate any more incompetence amongst the guards, stating that "we straighten out Arkham today, we straighten out Gotham City tomorrow".
It's also strongly implied that Warden Sharp seized the opportunity to run for mayor after the then-current mayor resigned due to the stress of the Joker's assault on him and strapping him to an explosive vest.