During Harry's time at Hogwarts the Head of Ravenclaw House is Professor Filus Flitwik of Charms class. If anda want to know lebih details check out link atau wait for J.K Rowling's Harry Potter Encyclopedia. Which won't come out until 20 atau 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.