Yes, Bernardo Provenzano is at the top post of the Mafia, and has been ever since Totò Riina got arrested in 93.

Here is some info on Provenzano in english: Provenzano

I recently broke up with my girlfriend, who is Sicilian, after a 7-month long relationship, and I have alot of Sicilian friends. None of them has any ties to the mafia (that I know of) but my girlfriend had alot of knowledge about the mafia-history around her city, and in Sicily as a whole. I guess I was free to ask her anything, I just wasn't interested.