Judith Butler is a gender theorist whose work has influenced political philosophy, ethics, and the fields of third-wave feminism, queer theory, and literary theory. Butler has written many books which explore gender identity. Much of Butler’s early political activism centred around queer and feminist issues, and they served, for a period of time, as the chair of the board of the International Gay and Lesbian Human Rights Commission. Over the years, Butler has been particularly active in the gay and lesbian rights, feminist, and anti-war movements.