Doyle Brunson the Godfather of Poker!
To be totally honest I have many favourite players I enjoy watching, Daniel Negs for one, he has an uncanny sense for predicting what cards an opponent is playing, I also enjoy watching a Dutch player Lex Veldhuis on-line he taught me a lot about playing Bounty Hunter games.
Over the years for me it has been Ivey & Negreanu. Of course these guys where at the forefront in the early years of TV poker and certainly the poster boys of that era.