Of the four "Seinfeld" leads, Jason Alexander has worked the most since ending the show. The actor has appeared on nearly two dozen television series, including "Star Trek Voyager," "Malcolm in the Middle," "Criminal Minds" and "Curb Your Enthusiasm." Alexander, now 54 (and sporting more hair than he did in the '90s), recently appeared as a cardiologist on "Two and a Half Men." —XFINITY Entertainment Staff (Photo by Alberto E. Rodriguez/Getty Images)
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