Przewodniczącym

nf. female head, female leader, female person in authority, female president; chairlady, chairwoman, female person who presides over something; female person who presides over a meeting; female person who presides a committee

nm. male head, male leader, male person in authority, male president; male chairperson, chairman, male person who presides over something; male person who presides over a meeting; male person who presides a committee