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The chairman (also chairperson, chairwoman or chair) is the highest officer of an organized group such as a board, a committee, or a deliberative assembly. The person holding the office is typically elected or appointed by the members of the group. The chairman presides over meetings of the assembled group and conducts its business in an orderly fashion. (Wikipedia)

The person in charge of a meeting or organization is referred to as the chair, or sometimes the chairperson. These words can be used to refer to either a man or a woman. (Collins Dictionary)

Whenever the position is occupied by a women, she is referred as chairperson. For a male member holding the position is referred either by chairman or chairperson. (Quora)

In the past, chairman was used to refer to both men and women, but it is now not often used to refer to a woman. The woman in charge of a meeting or organization is sometimes referred to as the chairwoman. (Collins Dictionary)

Many organisations still use chairman for the head of the board for both men and women.

Alternatives are chair or chairperson. The problem with chairperson is that people tend to say chairman for a man, and chairperson for a woman!

My preference is chair.

Chair has been recognised in the sense of ‘occupant of the chair’ since the 17th century. (Mary Morel, Online Writing Training)