Star Trek celebrity guest Jason Alexander playing Kurros in an appearance on a Voyager episode called Think Tank. He's a famous TV actor.
The top picture is the actor in normal circumstances, and the bottom picture(s) is of the actor in their specific role(s).
6 Pictures from Think Tank
Most famous for his role as George Costanza on Seinfeld. He also starred in classics like Coneheads in 1993, Shallow Hal, almost 50 other movies, and many other TV guest appearances, as well.
Think Tank -Star Trek: Voyager - 214 (episode # 5.20) -Playing Kurros -He made deals for the Think Tank. He tried to recruit Seven of Nine, but is thwarted when the think tank was de cloaked and the Hazari converged on it as Seven was beamed back.