Originally answered Jun 28, 2012
Culture is passed along from long-time members of an organization to new members in the form of advice, stories, and feedback. “This is how things are done around here” is an example of advice which perpetuates the culture. Telling stories of the founders, how a particular incident was handled, or the likely reaction to certain behaviors keeps the culture alive from generation to generation. Providing feedback on communication styles, meeting norms, policies, dress code, etc. helps newcomers learn the practical rules of the organization.
Culture can outlast and even undo a new leader of an organization. If a new leader sets out to change the culture, this may result in rejection and their ultimate departure.