A Mad Hatter is a CEO or a person at a managerial level whose ability to lead a company is questionable. A mad hatter takes decisions that is of little sense and makes employees and other stakeholders puzzled and suspicious. They usually make unusual and impulsive decisions and do not think about the consequences of such decisions on the company.
Sometimes the decisions are taken for personal gains but at other times they are just bad decisions.
Mad Hatter was a character in Lewis Carroll’s book Alice’s Adventures in Wonderland.