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