I don't know if there's anything like a Greatest Agent in Hollywood award, but if there is, it should certainly go to whoever represents Jeffrey Dean Morgan.
Among other film and TV credits going back to 1991, Morgan plays the character Denny Duquette on Gray's Anatomy. If you've never watched the show, you should have started a couple of sharks ago. But the Duquette character is interesting.
Since this is officially a hospital show (though I'd never want to be treated there for so much as a hangnail), there are a slew of one shot characters who appear for one episode, and then either walk away smiling or are carried out in a bag. These are plum roles for famous, formerly famous and would-have-liked-to-have-been-famous actors. They get to show off their dental work on the little big screen, without the commitment or dreaded career death of regular roles.
So here's Denny Duquette, awaiting a new heart for a transplant, and not quite making it. Pretty typical. The show burns through a dozen or two such characters each season. But Denny had to good fortune to become engaged to one of the hot young interns who seem to run things at Seattle Grace Hospital.
Now, despite the fact that his character died, Morgan has extended his role into its second season, and he's still having a torrid affair with this hot former-intern-now-resident! Being dead has not slowed him down in the least. Evidently metabolic dysfunction is not as debilitating as previously believed.
Like I said ... Greatest Agent in Hollywood!