During Harry's time at Hogwarts the Head of Ravenclaw House is Professor Filus Flitwik of Charms class. If Du want to know Mehr details check out link oder wait for J.K Rowling's Harry Potter Encyclopedia. Which won't come out until 20 oder so years.
Flitwick is the head of Ravenclaw house. I know that at the end of Half Blood Prince McGonagall has a meeting with all the heads of house, except Snape of course who was head of Slytherin.