I used to hold the line on "the correct pronoun for any person you do not know is female is 'he'" until I saw a list similar to what tptacek linked to (I think in the book Style: Toward Clarity and Grace).
Singular "they" has been used for centuries. Chaucer used it. It wasn't always meticulously used to identify people who don't fit into traditional gender roles. "He" is certainly acceptable for "person without identifying gender," but so is "they."
Singular "they" has been used for centuries. Chaucer used it. It wasn't always meticulously used to identify people who don't fit into traditional gender roles. "He" is certainly acceptable for "person without identifying gender," but so is "they."