Support - "chairman" is more common and unforced, and carries no implications of masculine sex, only gender (and anyway English doesn't really have grammatical gender). See Merriam-Webster's ("the presiding officer of a meeting, organization, committee, or event; the administrative officer of a department of instruction (as in a college)") and Oxford ("The occupier of a chair of authority; spec. the person who is chosen to preside over a meeting, to conduct its proceedings, and who occupies the chair or seat provided for this function.").  Talk