A leader or managerial team who makes impulsive or unusual decisions. Usually a CEO, a mad hatter will frequently make puzzling decisions, which may be questioned by people inside and outside the company. These individuals are also known for making instinctive decisions without thinking of the consequences. Sometimes, decisions made by a mad hatter are driven by personal incentives, not on improving the overall performance of the company.

The term was taken from Lewis Carroll’s "Alice’s Adventures in Wonderland". Alice met Mad Hatter at the tea table, who finds delight in frustrating Alice by constantly quizzing Alice with nonsensical and unanswerable questions.