Last year when promoted to Director, I was given another division to lead. That went very well.

I have now been appointed to help in another division. Unlike before there is already a director in charge, and he is polite but not happy.

I am tasked with better understanding the costs and finances of the division and making changes where necessary. It is not an area of the business within which I have technical expertise.

So the question is:

Does any one have any good advice on how to best interact with my peer, to assert my authority amongst his directs (and their directs) without conflicting or undermining his authority.

Regular meetings with him of course, but I feel that one-on-ones with his (my new) directs would be inappropriate. Direct feedback (model or otherwise) will also be difficult, at least in the short term.

Any gems of wisdom?

Any one gone through a similar situation?