As far as client pools go, Miami attorney Michael Kosnitzky's is rather finite.

"You've got about 3,500 billionaires in the whole world," Kosnitzky said. "I'm blessed to have a few of them as clients."

Kosnitzky represents the world's 1%, and as co-chairman of Pillsbury Winthrop Shaw Pittman's private wealth group, helps them navigate their worldly desires, while paying as little in taxes as legally possible.