Kidnapping Lucius Fox, CEO of Wayne Enterprises and personal friend of Bruce Wayne, Tetch attempted to copy the information from Fox’s brain to create more sophisticated mind control devices. Mad Hatter would eventually escape from Arkham and assemble a small gang of followers. His first professional crime as the Mad Hatter saw Tetch robbing Gotham’s high society, before being foiled by Batman and sent to Arkham Asylum. Tetch began his criminal career at a young age using his mind control devices to murder the entire Gotham Hawks high school baseball team. Allegations of pedophilia have also surrounded Tetch, who frequently involves children in his crimes.

When agitated or afraid, Tetch begins to rhyme as a defense mechanism, further reinforcing his resemblance to the fictional Mad Hatter. Tetch’s personality has been described by his doctors as acute manic-depression. Eventually growing to believe he was the embodiment of the fictional Mad Hatter character, Tech combined his love of Lewis Carroll with an equally obsessive devotion to hats. Jervis Tetch had been obsessed from an early age with Alice's Adventures in Wonderland and its sequel, Through the Looking-Glass.

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