strategist

The strategist is the one who forms strategy -- he or she is in charge of the overall strategic management process, but is specifically responsible for the strategy formation in the create art stage of the process.

Given that the strategist is responsible for all aspects of strategy -- from purpose and vision on -- they engage in generative learning and become designers of systems, i.e. the business organization, rather than just operators of systems.

For the overall business organization, the CEO is the chief strategist. Whether or not the CEO has all the requisite skills, he has the full responsibility to see to it that those with the requisite skills are employed to develop the strategy. For a business unit, the chief strategist is the head of the business unit.