What is the title of the head of state in Missouri?

In Missouri, the title of the head of state is the Governor. This position is the highest executive office in the state and is responsible for overseeing the state government, implementing state laws, and ensuring the safety and welfare of Missouri residents. The Governor has various powers, including the ability to veto legislation, appoint state officials, and manage the state budget.

The Attorney General, Treasurer, and Chief Justice serve important roles within the state government but do not hold the title of head of state. The Attorney General serves as the state's chief legal officer, the Treasurer manages the state’s finances, and the Chief Justice leads the state's judicial system. However, none of these positions possess the executive functions attributed to the Governor, making the latter the correct answer in this context.