Translation of "managing director" into Japanese

Guess what the managing director started off the meeting by saying. The first thing out of his mouth was an announcement of some major restructuring.

会議の席で常務は、開口一番何を言ったと思う。大規模なリストラ計画を発表したんだよな。

As head of the sales team she reports only to the managing director.

彼女はセールス班の長なので、上司は営業部長だけだ。

So, I decided to place my case before the managing director himself after witnessing to him.

それで私は,会社の取締役社長に証言したあと直接この件を相談してみることにしました。