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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)

Speaking after the ruling, chairwoman Mrs Judith Worthington said the committee recognised flaws in the hospital procedures contributed to the death but that Mulhem had acted with gross negligence. (BBC News)

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)