No CISO is an island. Of all the executive roles in a mature organization, the CISO is one of the most dependent on the collaboration and integration of disparate resources and people. The CISO is responsible not for a specific, discrete segment of a business model but for managing an abstract principle with shifting boundaries.

https://www.f5.com/labs/articles/cisotociso/nine-types-of-meetings-every-ciso-should-master