It is a choice to embrace an altered state, i.e. a transformation. Once you are successful with a transformation, your organization is equipped to replicate the success. Transformation provides a built-in learning opportunity for everyone in your organization, which makes the organization nimble and eager to take on new things.
For the organization at large, it is the chief executive who owns the culture. The larger the organization, the more cultures multiply. From department to department, cultures can be quite different, depending on the department leader. In any case, the leader of the organization ultimately owns the organizational culture.