That’s a very well considered toupee he’s wearing. It hardly looks like a dead, furry critter curled up on top of his head at all. Must be one of those natural human hair rigs.
He was going bald back in the early-mid 90’s when he was cast as an actor chosen to play George Costanza when Seinfeld had that episode where NBC wanted Jerry and George to write them a sitcom, and this Jeremy Piven was cast as George.