Jervis Tetch (Earth-4678)

"Are you not going to drink your tea? It's special tea. My special tea. My specialty."

- Mad Hatter

Jervis Tetch was a brilliant neuroscientist with some revolutionary ideas on the subject of brain chemistry and free will. Eventually, Jervis soon descended into mental instability himself. He thought himself the incarnation of the Mad Hatter from Alice in Wonderland, and took up hatmaking as a trade, and, even more disturbing, became a serial killer, marking a girl as "Alice", luring them away and then killing them. He took his knowledge of hypnotism and psychoactive drugs and began bending the minds of other people. Equally impressive, he found ways to incorporate mind-control devices into the hats he made and wore, to both augment his own talents and to render others more susceptible to his influence.

Source

 * https://dc.fandom.com/wiki/Jervis_Tetch_(Arkhamverse)