not a management model, nor a job title, nor 'waiting for permission'. Leadership is:
making a decision to do something even if you don't know if you are 'right'
taking accountability even when you haven't been given permission
doing what you believe is right even when you don't have the support of the majority
being one of the few even when it would be a heck of a lot more comfortable to be one of the many
You want to be a leader? Start.