The chairman rejected the proposal. ✬

I've spent so many years as chairman that I feel it's time I stepped down. ✬

He was elected chairman. ✬

He served as chairman for three years. ✬

He's the chairman of the committee. ✬

He was appointed chairman. ✬

He accepted his appointment as chairman. ✬

He acted as chairman. ✬

They elected him chairman. ✬

She was elected chairman of the committee. ✬