It is easy to forget that an organisation is set up to do more than just go about its regular activities to achieve set goals and complete its mission statement. But in truth, as we spend 1/3 of our day at work, it is important that we feel comfortable in our work environment and relaxed and motivated by our colleagues.
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.