Understand the problem
Knowing disruptive behaviour is key for anyone who wants to eradicate this from some individual. It is the kind of behaviour which is not at all appropriate for any person who is running an organisation or at least playing a major role in any industry. Having this behaviour or attitude leads sometime to a level where you cannot get hold onto your different mood swings. It is also important that when dealing with this problem, one should completely understand this behaviour and why it occurs.
Talk to the director
If you have identified this problem in your director, you should personally approach him and try to address the things which you and other employees have been noticing about his attitude and disruptive behaviour.
Talk to other co-workers
Talking to your co-workers about your disruptive director is also a good thing. They will also try to understand how to tackle this issue.
A serious meeting between board members and the director will give a better idea about this disruptive behaviour. In the meeting, you should explain all the things to the director who is having disruptive behaviour.